JPS6255632A - Lens information display device - Google Patents

Abstract

PURPOSE:To execute photographing by desired photographing magnification and photographing distance, and photographing for focusing an object to be photographed of a desired photographing distance range, by calculating and displaying automatically a photographing magnification, a photographing distance, and a depth of field, which are determined by both a master lens and a conversion lens from information being intrinsic or variable to the master lens and information being intrinsic or variable to the conversion lens. CONSTITUTION:As for a master lens ML, a zoom lens is used. In this master lens ML, a zoom encoder 1 outputs a signal DELTAZ corresponding to a zoom operation, namely, a focal distance setting operation, by encoding it to 4 bits. As for a conversion lens CL, a macro-converter which can vary a photographing magnification by moving a part of lenses is used. An operating circuit 11 calculates information of the photographic lens and the conversion lens which are outputted from a P/S converting circuit 5 and 10, respectively, and outputs serially a signal for showing specific lens information of the time when the conversion lens has been installed between a camera body CB and the master lens ML.

Description

[Detailed description of the invention] Production y> +)! The present invention relates to an interchangeable lens camera system in which a convergence lens is selectively inserted between a master lens and a camera body, and in particular, the present invention relates to an interchangeable lens camera system in which a convergent lens is selectively inserted between a master lens and a camera body, and in particular, it is possible to take pictures at a desired magnification and shooting distance, and to capture a subject within a desired distance range. The present invention relates to a device useful for focusing photography.

(For example, in order to manually perform photography at a desired photographic magnification and photographing distance, and to focus on a subject within a desired distance range, the photographic magnification and photographing distance at the current lens position of the photographic lens, The photographer must be able to understand the depth of field (hereinafter referred to collectively as lens information).
A display device for displaying this lens information is provided on the barrel of the photographic lens. Generally, a conversion lens is inserted between a master lens and a camera body for high-magnification photography or close-up photography. The values of the photographing magnification, the composite photographing distance, and the composite depth of field (that is, the composite lens information) change. However, the master lens display vcW1 merely displays lens information of the master lens alone, and is not configured to change the lens information in accordance with the optical characteristics of the convergent lens. Although it is possible to obtain this composite lens information using a mathematical formula, the calculation requires complicated addition, subtraction, multiplication, and division, and it is impossible to obtain it easily. Therefore, if a conversion lens is inserted,
The photographer has no choice but to judge the composite lens information of both lenses by analogy, experience, intuition, etc. from the display value of the master lens display device and the focal length change magnification value of the conversion lens, thereby obtaining accurate composite lens information. That was extremely difficult. In other words, when using a convergent lens as a master lens, the photographic magnification, photographing distance,
Since the exact value of the depth of field was not known, it was impossible to perform high-precision photography at a desired magnification or distance, or to focus on a subject at a desired distance.

In addition, one multiplier M is provided in the conversion lens,
The aperture value, focal length, and focus adjustment data of the master lens required for automatic control of the camera body are changed according to the focal length change magnification value of the conversion lens.
A device that sent out data to the camera body was published in Japanese Patent Application Laid-open No. 59-1.
No. 88622. However, the composite lens information obtained by this device is intermediate data for obtaining the final automatic control data, and is not necessarily data that should be displayed externally, such as photographing magnification, photographing distance, and depth of field.

In the present invention, a conversion lens is inserted between the main lens, the main lens, and the camera body, and it is possible to take pictures at a desired magnification or shooting distance, or to adjust the depth of field by 5'iL. When photographing a subject within a desired photographing distance range, composite lens information of photographing magnification, photographing distance, and depth of field determined by a master lens and a conversion lens can be obtained accurately and easily. The aim is to provide a device that can

Furthermore, the present invention provides at least one of the photographic magnification, photographic distance, and depth of field determined by both lenses from information unique or variable to the master lens and information unique or variable to the convergent lens. The present invention is characterized in that it includes means for calculating one piece of lens information and display means for displaying the calculated lens information. Note that preferably the calculation means and the display means are provided within the conversion lens.

With the above configuration, the shooting magnification, shooting distance, and depth of field are automatically calculated and displayed, so the photographer does not have to judge these composite lens information by analogy or intuition as in the past. The photographer can visually check the exact value.

Inu 2 1'' 1 A method for calculating composite lens information calculated according to the present invention will be explained based on FIG. 24. FIG. 24 is a diagram schematically showing an optical system when a conversion lens (CL) is inserted between a master lens (ML) and a camera body (CB). In the figure, 11u@(S) is the front principal point (of the subject (0')) of the master lens (ML).
The distance (B,) is the distance from the rear principal point (P2') of the conversion lens (CL) to the film plane (F
). In addition, the distances (cf, ) and (d2) are the principal point spacing of the master lens (M L L converge run lens (CL), and the distance (el) is from the a-direction principal point (P,') of the master lens (XCML). The distance (e2) is the distance from the master lens side mount surface of the conversion lens (CL) to the front principal point (P2).

22, the distance (el) of the master lens (M L ) changes according to manual operation of the focusing ring (not shown) of the master lens, and the distance (d,) changes depending on the focal point of the master lens (M L ) if the lens is a zoom lens. It changes in response to manual operation of a release adjustment ring (not shown). In addition, in the conversion lens (CL), if the imaging magnification of the lens is fixed, the distance (c12), (ez
)-(B 1) is fixed, but there is a manual operation ring (not shown)
If the photographing magnification can be changed by moving some of the lenses, the distance (ez)l (B1) will change. In the following, for the sake of simplicity, it is assumed that when (B1) increases, (ez) decreases by the same amount.

Now, in the embodiment described below, the master lens (ML
) and the composite focal length (ft) of both lenses (CL), composite photographic magnification (β), photographic V[
Distance (D), composite depth of field for front and rear (a), (b
), the effective aperture value (Fe) is calculated from the following formula.

First, the focal length of the master lens is set to the focal length of the converso thin lens.

Let the imaging magnification of the conversion lens be β2f, the allowable circle of confusion diameter be l/30 ram, the F number for an object at infinity be FOO, and the aperture value of the master lens be Fl.
fL = β2・rl β=1β1・β21 D = S +dl+e++e2+d2 + B la
=b=(i +1 /β)2 ・FOO/ 30F
e=F■(1+β) However, β2 = (β2 B1)/Izβ+ =1-
(e+ 10e2+ B +/β2)/LS = r, (
1, -1/β1) The relational expression Foo=F, -β2 holds true.

Here, when the focal length of the master lens (ML) and the imaging magnification of the conversion lens (CL) are both fixed, B++(Lwd2+e1e2*f+ is constant, so βz and It are uniquely determined. However, , e changes according to the distance adjustment, so β1 changes, and therefore β1.βr D +a+b+ F C changes.

On the other hand, if the master lens is a zoom lens, β2 is constant, but d,,f, change according to focal length #l adjustment, so ft, βv D 1albt F e all change, and from the above case calculation becomes complicated. Furthermore, if you can change the shooting magnification of the convergence lens B,, ez
As β2 changes, the calculation becomes even more complicated.

The present invention uses a microcomputer to calculate composite lens information that requires such complex formulas, and calculates information specific to or variable in the master lens (d++e+tf+) to be used for the calculation, as well as information on the Compa-Clan lens. Unique or variable information (d2te2+B,) is obtained from each lens.

A specific example thereof will be described below.

FIG. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention. In this embodiment, when a conversion lens is attached between the camera body and the master lens, the composite focal point l[distance] of both lenses is determined.

In the figure, a contact (TA) connects the camera body (CB) and the conversion lens (CL), and a contact (TB) connects the conversion lens (CL) and master lens (ML) to each other. connected. The camera body (CB) has a master lens (M
An 8-bit microcomputer (MC) (hereinafter referred to as MC) is provided which transfers information between the camera and the conversion lens (CL) and controls exposure calculations, focus adjustment, etc. This microcomputer (MC)
) is a clock terminal for serial input/output (CLK), an input terminal for inputting data serially (SIN), a conversion lens (CL), and a master lens (ML).
The chip select terminal is provided with an output terminal (CS) (hereinafter referred to as a chip select terminal) for commanding the drive timing of each circuit.

A zoom lens is currently used as the master lens (ML). In this master lens (ML),
A zoom encoder (1) encodes a signal ΔZ corresponding to a zoom operation, that is, a focal length setting operation, into 4 bits and outputs the encoded signal ΔZ. The decoder (2) counts and decodes the clock from the camera body (CB). Addressing circuit (
3) selects the signals from the encoder (1) and decoder (2) and stores them in the read-only memory (described later).
(hereinafter referred to as ROM). ROM (4
), information regarding the master lens (ML) is stored in advance for each of the seven addresses, and this address circuit (3)
When a 7 address is specified by , the information written in that address is output in parallel. P/S conversion circuit (5
) converts the parallel signal sent from this ROM (4) into a serial signal and outputs it.

The conversion lens (CL) allows you to change the imaging magnification by moving some lenses. 9 C1
:l inverter is being used. This conversion lens (CL) has an encoder (
6) encodes and outputs a signal ΔB corresponding to the imaging magnification (β2) that changes when some lenses are moved by external operation. Decoder (7) - 7f'less circuit (
8), ROM (9), and P/S conversion circuit (10) are the decoder (2) of the master lens (ML) described above, respectively.
Address circuit (3), ROM (4), P/S conversion circuit (
It has the same W dragon as 5).

Further, the arithmetic circuit (11) calculates information on the photographing lens and the conversion lens output from the P/S conversion circuits (5) and (10), respectively, and connects the conversion lens to the camera body (CB) and the master lens (ML). ) serially outputs a signal indicating unique lens information when attached between the The S/P conversion circuit (12) converts the serial signal output from the arithmetic circuit (11) into a parallel signal and outputs the parallel signal. A display circuit (13) is provided in the outer cylinder of the conversion lens (CL), and decodes and displays this parallel signal. In addition, the arithmetic circuit (11) and S/
The drive timing of the P conversion circuit (12) is determined by the decoder (7).
) is controlled by the output of

Next, the contact portions (TA) and (TB) will be explained. Each contact part is (T1) to (T5) and (Tll) to (T1), respectively.
5) It is composed of five contact points. Contact (T 1)
, (T 11 ) are contacts for power supply from the camera body (CB) to each circuit of the conversion lens (CL) and master lens (ML), (T 2 ), (T 12 )
is a contact for input/output clock, (T3) is a compurge switch,
The contact point (T13) is for outputting the output signal of the arithmetic circuit (11) of the master lens (CL) to the camera side, and the contact point (T13) is used to output the output signal of the P/S conversion circuit (5) of the master lens (M L ) to the conversion lens ( connection for output to CL),
α, (T4), (T14) are contacts for chip selection,
(T5) and (T15) are ground contacts.

FIG. 2 is a circuit diagram showing a specific example of the zoom encoder (1), decoder (2), and 7-dress circuit (3) of the master lens (ML). In the figure, the decoder (2) is
An octal counter (21) that outputs a carry pulse when 8 pulses are counted, a counter (22) that counts the output pulses from this counter (21), and Te, ROM (4)
Decoder 1 (23) that specifies the contents of the lower 4 bits and upper 4 bits of the 8 bits of the address.
and a decoder 2 (24). The selector (25) of the address circuit (3) sets the lower 4 bits of the address of the ROM (4) as data for the decoder 1 (23) or the zoom encoder (1), depending on the contents specified by the decoder 2 (24). ) data.

This can be seen in Table 1 showing the data contents of the ROM and l/
This will be explained with reference to the m2 table. That is, when the chip select signal (CS) is input through the contact (T14), the counters (21) and (22) are reset. At this time, the decoder (24) OH the upper 4 bits, and the decoder (23)
), the lower 4 bits are set to OH, and each is designated as an initial address. A check signal indicating attachment of the master lens is stored at address 00H of this ROM (4).

The octal counter (21) generates one pulse when eight locks (CLK) are input through the terminal α (T12), and the counter (22) counts this.

When the count number is "1", the content of decoder 1 (23) becomes IH, and the selector (25) specifies 01■ (as the address of ROM (4). This ROM (4)
The apex value (AVo) of the open aperture value at the shortest focal length of the zoom lens is stored in the address OIH of the zoom lens.When the second pulse is generated by the zero-order eight clock inputs, the count number of the counter (22) is "2'', and 02H is designated as the 7th address of ROM (4).

The apex value (AV theory aX) of the minimum aperture value of this master lens is stored at address 02H of this ROM (4).

Next, when the third pulse is generated from the counter (21), the contents of the decoder 2 (24) become IH, and the selector (25) uses this as the information of the lower 4 bits of the ROM (4) to output the zoom encoder (1). ). Therefore, 1 ning H (* indicates the contents of zoom encoder (1) at that time, for example, zoom encoder (
If the content of 1) is 0000, the address becomes IOH).7 Address specifies the content of the ROM. This ROM
In address 1 H of (4), aperture value change data (ΔAv) indicating how many Ev the aperture has changed from the open aperture value of the shortest focal length due to zooming is stored.

At the next 4th pulse, decoder 2 (24) becomes 2H, and R
The contents of the zoom encoder (1) are taken as the information of the lower 4 bits of OM (4). Address 2* of ROM (4)
Data (f,) indicating the focal length that changes due to zooming is stored in H.

Based on Figure 3, the encoder (6), decoder (7), and address circuit (8) of the comparsilane lens (CL)
Explain how it works. The decoder (7) has the same configuration as the decoder (2) in FIG. 2, and has an octal counter (51
)t counter (52), decoder 3 (53), and decoder 4 (54). Here, the decoder (53
) and decoder 4 (54) designate the upper 4 bits and lower 4 bits of the 8 bits of the address of the ROM (9) according to the count value of the counter (52). Further, the selector (55) of the address circuit (8) uses the signal l of the decoder 3 (53) to select the lower 4 bits of the address of the ROM (9) to the encoder (6) or the decoder 4 (
54) to select which data to use. Additionally, the encoder (6) specifies the lower 4 bits of the ROM (
In address 1 H of 9), the photographing magnification (β2) that changes as the lens moves is stored in logarithmically compressed form.

Generally, the camera body (CB) and master lens (ML)
When a conversion lens is attached between the master lens (M L
) If you send the shooting information as is to the camera, accurate exposure calculations will not be possible. Particularly, when a Funbarbutan lens whose magnification changes as in this embodiment is attached, calculations for obtaining photographic information that changes in response to changes in magnification are complicated as described above. Therefore, in this embodiment, when the comparbutane lens (CL) is attached to the VC, the camera's photometry mode becomes aperture metering (so-called actual aperture metering).
Exposure calculation can be performed even without such lens photographing information such as the maximum aperture value.

In other words, regardless of the shooting information of the master lens (ML), specific data FF is transferred from the conversion lens (CL).
11 is sent to the camera side, and the camera side receives this data and sets the aperture and metering mode. Then, this specific information is stored in the 7-address OOH of the ROM (9), and when the third pulse is sent from the octal counter (51), this data is sent through the arithmetic circuit (11). control so that the signal is sent to the camera side (signal b).

Note that when a conversion lens with a fixed magnification is attached, it is only necessary to change the aperture of the master lens (M L ) by the same amount of magnification, so the conversion lens (CL
) before sending it to the camera. That is, in this case, it is sufficient to add the magnification (ΔA'v) to ΔAv and send this data. Then, in the camera body (CB), AVo + (AAv + △A'v), Avma
x+(ΔAv+ΔA'v) is calculated to determine the maximum aperture value and the minimum aperture value of the entire photographing optical system. Further, the composite focal length (rt) of all the photographing optical systems changes depending on the photographing magnification (β2) data. In the camera body (CB), the camera shake warning shutter speed is changed according to the value of this composite focal length. Therefore, the data of the photographing magnification (β2) is sent to the camera body (CB) following the above specific information, that is, the octal counter (51)
When the fourth pulse occurs, address 1 of ROM (9)
This H is specified, and the data of the imaging magnification (β2) is stored in the ROM (
9) is output.

The timing of this data output is determined by the master lens (
The fourth pulse is generated from the octal counter (21) of the ML), the address 2 quintillion H of the ROM (4) is specified, and the focal length fi ( f
l) When information is sent. Therefore, when the fourth pulse is counted by the counter (22), 7dress 1*H of the ROM (9) is specified and the calculation circuit (11) calculates the composite focal length. It is done. Further, the control signal (a) is given to the S/P conversion circuit (12), whereby the above calculation result is converted into a serial signal, and the calculation result (i.e., composite focal length) is displayed in the display circuit (13). be done.

Next, the arithmetic circuit (11) will be explained based on FIGS. 4 and 5. The arithmetic circuit in Fig. 4 is composed of a serial adder circuit, and it combines the logarithm value of the focal length 11i1D, ) sent from the P/S conversion circuit (5) of the master lens (ML) and the convergent lens (CL). P/S conversion circuit (1
The purpose is to calculate the sum of the logarithmic value of the imaging magnification (β2) sent from 0) and the combined focal point [distance ft (=f, ·β2)].

First, a chip select signal (CS) is input prior to the clock pulse (CLK), and this chip select signal (CS) causes carry information (Cy) to be output from the Q terminal of 7 lip 70 lip (F Fl ). is reset.

Then, in synchronization with the clock pulse (CLK), the master lens (M L ) and the convergent lens (CL)
2 sent from each P/S conversion circuit (5) and (10) of
2 serial data D0 and 2 serial data D0 and 2 are sequentially from the least significant bit.
It is input to two input terminals A and B. Day) (E R1
) outputs the exclusive OR of inputs A and Bf), and this output (S o) is further exclusive ORed with the carry information (Cy) at data (ER2) (output S,).゛7nd date (AN3) via Noah day) (OR,)
The carry information output (Sl) which is inverted at
The signal is delayed by one clock and output. In the example in Figure 5, 4
f! The data D of the chromatic lens (ML) is “0001111
0”, conversion lens (CL) data D,
ooooioioiO" and the carry signal is "00t31
1100", and the sum signal (S) is 00101000
”.

The control signal (a) from the decoder 3 (53) is “Low
” level and go) (AN5), pass the data D of the photographing lens (ML) as is, and select “Hi”.
When the control signal (b
) is at “High” level, and date (AN8
) and converter lens (CL) data D
1 is passed through as is, and when it is at the "Low" level, the data D0 or the calculation result is output.

The operation of the microcomputer (MC) of the camera body (CB) will be explained according to 70-char shown in FIG.

When the camera's metering switch (Sl) is turned on (#1)
, the microcomputer (MC) sends the chip select signal (CS)
``Low'' level #3), and the count number N is initialized to O''(#4). and output the serial command,
Connect the serial input/output clock (CLK) to the contact (T2)
, (Input/output 8-piece sending information via T12>)
#5). When this input/output operation is performed 5 times (#7),
The chip select signal (CS) is set to "High" level (#8), and the full data input/output is completed. Next, photometry is performed, and exposure calculation is performed based on this result (@12° #14). In addition, the content of ΔAv is determined from the data read into the camera body (CB) in steps #5 to #7, and if ΔAv is FF11, the aperture metering mode is set and only the shutter speed is calculated (#12). ,F
If it is not F11, Avo+ΔAV, A vu+ax
+ΔAv is calculated and the calculation is performed in the set mode (#14). It is determined whether the photometry switch (Sl) is still turned on (#15), and if it is turned on, the process returns to step #3 and the above-described operation is repeated. On the other hand, if it is OFF, the microcomputer (MC) stops oscillating the system clock and enters the stop mode. Further, when the release switch is closed, exposure control is performed based on the calculation result.

Next, the overall circuit operation will be explained with reference to FIG. still,
The time chart is shown in figure fjS7. When the photometry switch (Sl) is turned on, the chip select signal goes low.
w" level, and the decoders (2) and (ma) start counting. Then, in the master lens (ML), the ROM (4) of the 8 pins specified by the address circuit (3)
The contents of the serial input/output clock (CL
At the first rise of K), the least significant bit of this content is output from the P/S conversion circuit (5) to the arithmetic circuit (11) of the conversion lens (CL) via the contact (T13). At this time, the liquid calculation circuit (11) is connected to the decoder (7).
Since the control signals (a) and (b) are both "Low", the bit signal is directly output to the camera body (CB) via the contact (T3). Thereafter, the contents of the ROM (4) are changed bit by bit in synchronization with the rising edge of the clock.
It is converted into a serial signal by the S converter circuit (5) and output to the camera body (CB). ROM(4) as above
The operation of outputting the data as is to the camera body (CB) is performed three times.

And the conversion lens (CL) octal counter (
When three pulses are output from 51), the decoder (
53), the decoder (54) is at address 0 of the ROM (9)
Specify 01-I. At this time, the control signal (b) is High.
h'' level, and the contents of this RC)M(9), such as FF11, are converted into a serial signal and transmitted to the camera body (CB).

Next, when the fourth pulse is output, the master lens (
The focal length information of ML) is transferred from ROM (4) to P/S.
The signal is output to the conversion circuit (5) and then to the arithmetic circuit (11) of the conversion lens (CL) via the contact (T13). At the same time, a control signal is output from the decoder (7) in order to read out the contents of the photographing magnification (β2) of the comparator lens (CL), calculate it, and perform S/P conversion. In synchronization with this control signal, the decoder (7) and encoder (
The contents of the ROM (9) at the address designated by step 6) are output to the P/S conversion circuit (10), P/S converted, and output to the arithmetic circuit (11). Arithmetic circuit (11)
both P/S conversion circuits (5) in synchronization with the control signal,
(10'), the bits output from the lower order are added in series, and this calculation result is output to the camera side, and the S/
Output to the P conversion circuit (12). S/P conversion circuit (12
) completes inputting the signal of the calculation result, converts it into a parallel signal and outputs it to the display circuit (13), which displays the composite focal length Bt). When the microcomputer (MC) finishes inputting the above calculation results, it sets the chip select signal to the "HiHb" level and ends the serial input/output.

The appearance of the conversion lens (CL) of this example is shown in Fig. Pt58 and Fig. 9. A display section (D) is provided on the outer cylinder in a direction perpendicular to the optical axis. The display contents are the first
The display of 6fTQTAL and 1 shown in FIG. Further, the outer cylinder is provided with a rotation ring (C) for changing the photographing magnification by manual operation.

In the above embodiment, a zoom lens is used as the master lens, but a fixed focus lens may also be used. In that case, the zoom lens (1) is deleted and the ROM is used to store the contents of the maximum aperture value, minimum aperture value, and focal length. If you need each of the above information by combining each address in (5),
All you have to do is read out the fixed information for each.

In the embodiment described above, the composite focal length was calculated, but an embodiment will be described below in which, in addition to the composite focal length, the composite photographing magnification, photographing distance, depth of field, etc. are also calculated. In this embodiment, the parts of the conversion lens circuit that are different from the previous embodiments and their operations will be mainly shown.

Figure @ii shows its circuit block diagram. In the figure, S
The /P conversion circuit (101) converts the serial signal sent from the master lens (ML) via the contact (T13) into a parallel signal. The encoder (102) has switches (SWI) to (SWI) for selecting shooting information to be displayed.
The open/close signal of W5) is input, and this switch information is encoded. The microcontroller (MC2) is a one-chip microcomputer with built-in ROM and RAM, and the master lens (ML
) calculates and processes information sent from The P/S conversion circuit (103) converts the parallel signal sent from the microcomputer (MCz) into a serial signal and connects it to the contact (T3).
The information is transmitted to the camera body (CB) via the CB. Decoder (1
04) decodes the signal from the microcomputer (MC2) and outputs the signal to the display device (105). Encoder (
107) is the fabrication ring (C) of this conversion lens.
The extended position (lens position 1ff) is detected, and a signal corresponding to the extended position is encoded and output to the microcomputer (MC2).

The operation of the above circuit is shown in Fig. 12 by the microcomputer (MC) on the camera side.
) and the 70-chart of the convergent lens microcomputer (MC2) shown in FIGS. 13 and 14. First, the microcontroller (MC) on the camera side
) 70-chart differs from the above-described m6 70-chart in that the number of serial input/output (SIO) operations is 5 to 7 times. In addition, the 6th and 7th S
The data sent from the conversion lens during IO operation is not used.

When the photometry switch (Sl) is turned on (#21), the chip select signal C8 changes to LoII+'' level, and the INTya of the convergent lens microcomputer (MC2)
This falling signal is input to the child. As a result, the interrupt is sent to the microcomputer (MC2), and the interrupt 70- shown in FIG. 13 is executed. In addition, the control clock of the microcomputer (MC2) is equivalent to (10
0 times or more) faster.

At 70- in Figure 13, interrupts are first disabled and the internal RA
Reset M and flag, count flag (CF)
(#51 to #53). Next, the output terminal (op
, ) to "Lo-" level (#54), this "Lo-"
The w″ level signal is output to the display device (i!(t o s )) and inhibits the display operation of the display device fi (105).

In addition, the count numbers i and N are initialized (i = O, N =
O) To be done (#55.#56).

Next, the value of N is determined, and if it is 5 or more, the process moves to step #62 without outputting data to the P/S conversion circuit, and if it is less than 5, the count flag (CF) is determined (#58).

Since this flag (CF) is now set, the program proceeds to step #59 and specifies the ROM address 0N11 (that is, the upper 4 bits are set to 0 and the lower 4 bits are set to the value N). As a result, the RO stored at the specified address
The data of M is output to the P/S conversion circuit (103) (
#61).

Next, when the serial input/output clock (CLK) falls (#62), 1 is added to i (@63), and it is determined whether or not i has become 8 (#64). If it is not 8, the process returns to step #62 after a predetermined waiting time (#65). The reason for providing this waiting time is that the clock for serial input/output (CLK) is slower than the clock for the microcomputer (MC), so one of the clocks for serial input/output
This is to prevent the possibility that the loop of steps #62 to #64 will be repeated several times at the falling edge of the cycle. i is 8
(In other words, 8 serial input/output clocks (CLK) are sent), the microcomputer (MC2) inputs the contents of the S/P conversion circuit (101) and inputs the contents to the predetermined register (
IN ■) ($66, #67).

The P/S conversion circuit (5) of the master lens uses a clock (
Data is output at the rising edge of CLK), and the
)B The S/P conversion circuit (101) of the master lens takes in this data at the rising edge of the clock and performs S/P conversion. Therefore, in this state, the P/S conversion circuit (5) of the master lens converts the data into 8-bit data. The information is transferred to the S/P conversion circuit (101
) has been output to the converter lens (CL).
1t S/Pt exchange! (101) has finished converting the input serial signal into a parallel signal. Then, by adding 1 to N (#68) and repeating the above steps #56 to #68 seven times (#69), the microcomputer (M
C2) finishes inputting data from the master lens necessary for calculations to be described later.

Note that the microcomputer (MC2) specified in step #59 above
) is the address of the ROM in which the predetermined master lens (
For example, lens data including a converter butane lens in a specific case where r=50 +aLIl, F NOI, 7) is attached and the conversion lens is at a position exhibiting a predetermined magnification is stored. The reason why this specific data is first output to the camera as described above is as follows. In other words, on the camera side, exposure calculations and focus adjustment are controlled based on data from the lens, but when a conversion lens is attached between the camera body and the master lens, the data of the master lens and the data of the conversion lens are It is necessary to calculate accurate lens data. In this case, since a predetermined amount of time is required for the calculation, accurate data cannot be sent to the camera side at the same time as predetermined data is extracted from the master lens. Here, it is possible that data is not sent, but there are problems such as exposure calculation information not being displayed immediately after pressing the camera's metering switch (SL), or the start of focus adjustment operation being delayed because there is no lens data. It has spots and is undesirable. Therefore, the above specific data is output as dummy data for calculation in the camera.

Data contents, master lens and microcomputer (MCz)
Table 3 shows the relationship between the ROM address, the RAM (register) designation described later, and SWI to SW5.

The circuit configuration of the master lens is the same as in Figure 1, but R
The difference is that OM(4) has two more contents. One of them is the distance (e,) from the master lens mount to the rear principal point, which is stored at address 23H.

What remains is the distance (dl) between the front principal point and the rear principal point of the master lens, which changes with zooming in the case of a zoom lens.

This data is stored at three addresses in the ROM (4). Incidentally, a signal coded according to the zooming described above is input to the tree.

I will continue the explanation by turning to the microcomputer (MC2) 70-.

When the microcomputer (MC2) finishes inputting data from the master lens and outputting data to the camera side, it performs necessary data calculations based on the input data from the master lens and the data from the conversion lens (#70). ). A detailed flow of this calculation is shown in FIG.

First, the microcomputer (MC2) uses the RA that stores the data.
The contents of M (register 10H) are transferred to RAM (register 20H).
) (#100). Next, the encoder (107) reads code data indicating the lens position of the conversion lens, and this data is used to control the microcomputer (MC).
2) Specify register 2*H in the ROM to read the logarithm value logβ2 of the photographing magnification of the component lens,
RAM (register 2AH) I, :/Mo')-t (91
02-#106).

It should be noted that data hooded according to the position of the conversion lens is input as 4-bit information to the address 2-H tree.

Then, calculate the sum of the logarithm value log of the focus and α distance read from the master lens in the flow described above (read from l'e RAM (register 14H), $108), and the logarithm value logβ2 of the photographing magnification of the conversion lens. Take ($$110). As a result, the composite focal length (rt=β2・r+) when the conversion lens is attached
is obtained in logarithmically compressed form. The microcomputer (MC2) stores this composite focal length (logft) in the RAM (register 24H) ($112).

Next, the composite imaging magnification β is calculated. Here, first, the imaging magnification β of the master lens when the comparator lens is attached is calculated. So, encoder (107) again
Read the lens position of the conversion lens (#
114) According to this lens position, specify 1 address H and 4*H in the ROM and calculate the distance B1 from the film surface to the rear principal point of the conversion lens and from the front principal point of the conversion lens to the mount on the master lens side, respectively. Read the distance e2 of
2DH) (#114 to #118).

Also, the logarithm value 1ogf of the master lens focal length is read out from the RAM (register 14H) (12o), and this is expanded logarithmically and stored in the RAM (register 2C11) (#122.124). Similarly, logarithmically expand the logarithm value logβ2 of the imaging magnification of the convergent lens, and RA
Memory in M (register 2E11) (#126
~#130), and the distance from the front principal point of the conversion lens to the mount on the master lens side e21 Focusing of the master lens @ r +- Distance from the mount of the master lens to the rear principal point @e2. Photographic magnification of convergitan lens β2. [lB] from the film plane to the rear principal point of the conversion lens.

are RAM registers 2DI+, 2CH, and 15H, respectively.
.

2 Read from EH, 29H and get β, = 1-1 /f
Calculate l(el+e2+Bl/β2)#132,
#134), and stores this value β in the RAM (register 2BH) ($136). And this imaging magnification β1
is logarithmically compressed and the sum of this and the logarithmic value eoHβ2 of the imaging magnification from the RAM (register 2AIl) is calculated (I 138~
#142>. As a result, the composite imaging magnification β (=β1・β
2) is obtained in logarithmically compressed form.

This value is stored in RAM (register 25H).

(#144). Next, the distance from the film surface to the subject is calculated. Here, the focal length of the master lens [11, the imaging magnification of the master lens β1. The distance between the front principal point and the rear principal point of the master lens, dll, and the distance e, from the rear principal point of the master lens to the mount, are stored in RAM.
registers 2CI+, 2BI+.

1611.1511, and the distance B2 from the film surface to the mount on the master lens side of the conversion lens is read from the ROM. As a result, the distance from the film surface to the subject can be calculated using the formula D=11 (1-1/β,
) +d, +e, +Bz, (#146 to #150
), shooting distance D f, RAM (register 26H)
to memory.

Next, the depths of field a and b are calculated. Here, RAM
(Register 25H) to logarithm value 1ogβ of composite shooting magnification
is read out, logarithmically expanded, (1+β) is calculated from this value β, logarithmically compressed, and stored in the RAM (register 2F11) (#154 to #180). Next, the imaging magnification of the converged 3-lens lens is ogβ2, and the composite imaging magnification lo
gβ, log(1+β), the open aperture value Avo at the shortest focal length of the master lens (zoom lens), and the aperture change amount ΔAν from the above AVO due to zooming, respectively, are R.
AM register 2All, 2511゜2 Fl(,11
11, 1: Read from Hl (#162). Then, the depth of field at this time is determined.If the permissible circle of confusion diameter is 1730m+n, F is the maximum aperture value, and ΔF is the amount of aperture change from the maximum aperture value, the front depth a and the rear depth are is determined by the formula. Taking the logarithm here is +i'ogFo+logΔF, and if the master lens is in the open state (oga=
= eogb= -1oH30+(logβ2 + 2
(1'og(1+β)-11ogβ)+(^v0+△^
v)/2. Therefore, by performing this calculation, the logarithmic compression value of the depth of field when the aperture is open (1oga = 1ogb
) (#104) and store it in RAM (register 27H) ($164.16c5).

Next, an effective aperture value Avc is calculated. Here, the logarithmic value of the photographing magnification of the Funbarjiran lens is 1ogβ2, o8(
1+β) and the aperture change amount Δ8V due to zooming are stored in RAM registers 2AH and 2FI+, respectively.

Read from 13!1 and find the effective number of aperture steps when the conversion lens is attached ($168, #170
). The current effective fringe value Fe is Fe=Fβ2(1+β)=(F,xΔF)β2(1+β
), and the logarithmically compressed result is 1ogF e= 1ogF o+I! ogΔF+1og
βz+10g(1+β)=(8V.1Δ^v)/2
+logβ2+log(1+β). And if we show the effective aperture value in apex, Ave=”21ogF
e= A Vo ten ΔA v+ 2 (1ogβ2 +
log(1+β). If we now transmit the maximum aperture value of the master lens to the camera side as is, the total change in effective aperture when a convergent triple lens is attached is ΔAve=ΔA v+ 2 (1ogβ2+j!og(
1+β)). The effective aperture change amount ΔAve obtained in this way is stored in the RAM (register 23H) ($172). Next, the open aperture value Avo and the effective aperture change amount ΔAve are stored in RAM (register IIH).

23H) and find the effective aperture value (Ave),
Store in RAM (register 28H) (#174
~#1°78). Then, move the contents of RAM register 11H to register 21H and the contents of register 1211 to register 22H, and return to the original routine (#1
ao~#184).

When returning to the original routine, first, the cutter 7 lag (CNTF) is reset (#71), and then the lens information changeover switch signal is input from the encoder (102) to determine which switch was operated. do(#
74). Specify the RAM register that stores the corresponding lens information. The specified contents are then output to the decoder (104) and a signal indicating information about this switch is output (#76). In order to display the content decoded by this decoder (104), the output terminal (OP
, ) outputs the "1 gl+" signal to the display 5A (105) (#78). This allows the desired lens information to be displayed on the display device (105).

Next, proceed to step #79 and start the timer. This timer is configured by the hardware inside the microcomputer (MC2), and the metering switch (Sl) on the camera side is turned off.
This is to stop this microcomputer (MC2) after a certain period of time when F is turned on.

In step #80, it is determined whether 3 seconds have elapsed. If 3 seconds have not elapsed, the process proceeds to step #81, and the chip select signal (
The falling edge of C6) is determined (#81). If this falling signal is not received, the process returns to step #80 and this routine is repeated. If the photometry switch (Sl) is turned on,
The falling edge of the chip select signal (CS) is output from the camera side within 3 seconds, so this falling signal is sent to the input terminal (
When the IP address is input, the microcomputer (MC2> stops the timer #82) and returns to step #55.

In the step well 55, the count number, N, i
Initialize and perform step #57. Proceed to $58. In step #58, since the counter 7 lag (CF) has been reset, the process proceeds to step #60, where the RAM register 2NH is designated and its contents are output to the camera side. Here, the RAM register 2N) 1 stores data calculated or transferred in the above-mentioned calculation subroutine. Therefore, the content output to the camera side for the first time is check data, followed by Im maximum aperture value Av. , minimum aperture value Avmax*aperture change amount ΔAV due to zooming, and composite focal length @rt are sequentially sent to the camera body. Thereafter, the above-described flow is repeated from steps #61 to #71. The effective aperture value (Av,
+ΔAve), and exposure control is performed based on the result of this calculation.

The display segments in this variation of the display section (D) are shown in FIG. 15, and the display contents are shown in FIG. tjS16.

In Fig. 17, (a) is the composite focal length (ft), (
A) is the composite shooting magnification (β), and (T) is the distance from the film surface to the subject ff['! (D) (1) is the effective aperture value (Fe
) and (e) show examples of how the depth of field is displayed.

Meanwhile, in step #80, the photometry switch (Sl)
3 seconds after the MC is turned off, the microcontroller (MC,
) resets RAM and flags and also outputs (OP
, ) to the "Low" level to disable the display operation of the display device (105) (#84), and enable interrupts (#84).
85) and then stop (#86).

Note that in the calculation subroutine of FIG. 14, the distance @e+ from the mount surface of the master lens to the rear principal point is constant, but in reality, this distance varies to some extent.

However, the amount of change is very small compared to the whole, so
Even if this is approximately constant, it will not result in a large error.In order to eliminate this error, a code plate is provided on the distance adjustment ring of the master lens, and an encoder is installed that reads the code data on this hood plate and specifies the address of the ROM. , R.O.
The above distance a according to the position of the distance adjustment ring to the corresponding address of M
What is necessary is to store the information of el.

The contents of each signal in the above flow will be explained with reference to the time chart shown in FIG. 17. First, turn on the photometry switch (Sl) on the camera side, and the chip select signal (
CS) falls, a falling signal is input to the interrupt terminal (INT) of the microcomputer (MC2), and the above-described flow is executed. And input terminal (IF5) from the camera side
The clock for serial input/output is input to . When eight locks are sent like this, one data input/output is completed.

If this kind of data input/output is repeated a total of 7 times,
The chip select signal (CS) becomes "High" level. When the chip select signal (CS) falls to perform serial input/output again and input/output of the same seven data as described above is completed, the output terminal (op
, ) becomes "High" level, and the display device ra (10
In step 5), display of lens information is started. After that, the photometering switch (Sl) is turned off, and then the microcomputer (MC)
When step #80 of 2) is reached and 3 seconds have elapsed, the output terminal (OP+) becomes the "Lou+" level, the display goes out, and the microcomputer (MC2) stops operating. Although examples have been shown above based on the present invention, the present invention is not limited thereto. For example, display device r! 1 (105), it would be more convenient if the subject distance (D) and depth of field could be displayed simultaneously, as shown in FIG. Furthermore, even with a single lens, a circuit similar to that of the Funbarbutan lens of the above embodiment may be provided to display the subject distance and depth of field. Further, the conversion lens is not limited to a macro converter; a teleconverter can also perform the same function.

A third embodiment of the invention will be described below. In this example,
Simple calculations are possible using a calculation circuit as shown in figure f:54, and data is sent through the first serial input/output to the camera side, and all complicated information from the master lens side is input. Operations that would otherwise be impossible are performed by a microcomputer.

The circuit configuration shown in Figure 19 is basically the same as that shown in Figures 1 and 11.
This is a combination of the configurations shown in the figure. The difference is that by adding serial input/output functions and display control functions compared to the microcontroller shown in ml1, the S/P conversion circuit shown in Fig. 11 (
101), P/S conversion circuit (103) and decoder (1
04) was deleted. Also, by adding selector 1, it is possible to select whether data output to the camera side is sent from the arithmetic circuit or from the microcomputer (MC3).
By adding selector 2, microcomputer (MC2
), it is possible to select whether to use the master lens data or the calculated data as the serial input signal.

Furthermore, in the above-mentioned embodiment, FFH specific information is stored at address 001-1 of the ROM, and this content is sent to the arithmetic circuit, and then sent as is to the camera side, where it is used for initial calculations in the camera body. However, in this example, depending on the position of the conversion lens, 2 trees I (
, and add β to that address.
Enter the logarithm value of 2(1+β). Here, β2 is the imaging magnification of the conversion lens that changes depending on the lens position of the conversion lens. Further, β is a composite imaging magnification β=β, β2. In this case, since β≦1, the intermediate value β=0.5 is adopted. Then, the arithmetic circuit calculates the sum with the aperture change amount ΔAv due to zooming sent from the zoom lens (master lens), and transmits the sum to the camera side.

To briefly explain the overall flow, from the first to the third serial input/output, the information of the master lens is sent as is to the camera side, as in the f51 diagram. At the fourth time, as mentioned above, in the fluid circuit (211),
Information that is the sum of the conversion lens β2 (1+β) information and the master lens aperture change amount ΔAy is sent to the camera side. On the 5th time, the focal length of the master lens is logf + and the conversion lens is taken 15
Multiply the sum of 1' l ogβ2 and get the composite focal length @l
Find ogrt and transmit it to the camera side. Microcomputer (MC,
) is the master lens (zoom lens) in the above information.
Input the open aperture value Avo, the aperture change amount ΔAv, and the composite focal length ft at the Et short focus distance, and then use the following two serial inputs and outputs to calculate the distance el from the master lens mount to the rear principal point. Input the distance d1 between the front principal point and the rear principal point of the master lens. After the above seven serial input/outputs are performed, the microcomputer (MC3) adjusts the imaging pressure
Perform the calculation of D. Then, it performs almost the same operation as 70- in FIG. 113 to perform serial input/output again.

At the fourth time of serial input/output at this time, that is, when transmitting the effective aperture stage number (ΔAve) to the camera side, the accurate value obtained by the above calculation is transmitted to the camera side. Other than that, it is the same as the serial input/output described above.

Next, the operation of the microcomputer (MCs) will be explained with reference to the flowchart shown in FIG. Note that only the differences from the flowchart shown in FIG. fIS13 will be explained. First, when an interrupt occurs, a timer is started in step #204. Microcontroller (M) related to this timer
To describe the process of C:l), the microcomputer (MC3) completes serial input/output 7 times (#230), and after the calculation is performed (232), it checks whether 3 seconds have elapsed in step #242. If 3 seconds have not elapsed, the chip select signal (CS) is set to “Higl+” in the next step.
Determine whether the level has been reached. If it is at the "Higl+" level, the count flag (CNTF) is reset (9246), the timer is reset and restarted (#250), and the process returns to step #210.

Selector 1 (214) and selector 2 (215) in Figure 19
) control and serial input/output will be explained. After the interrupt, in step #208 the output terminal (op 2), (OP
3) to “Low” level, ryI 3 circuit (2
The outputs of 11) are output to the microcomputer (MC,) and the camera body, respectively. Except for the fourth serial output, that is, the data transfer of the effective aperture stage number ΔAv'e, step #22 performs serial commands from step #212.
Move to 2. When the serial input/output is performed for the fourth time, the output terminal (OP2) is set to the "High" level, and the microcomputer (MC3) inputs the aperture change (ΔAy) due to zooming of the master lens (#214). Also, after the calculation is performed once (after passing step #232 once), the microcomputer (MC,
) to output the calculation result to the camera body, set the output terminal (OPs) to “High” level and also
Specify the register 2311) to set the specified data in the serial input/output register, and then use the next serial command to output data bit by bit in synchronization with the rising edge of the serial clock, and in synchronization with the falling edge of the serial clock. The data from the arithmetic circuit (211) is taken into the serial input/output register bit by bit (#218 and #220). And step #2
A serial command is executed in 22, and the second and fourth instructions are executed in RAM (register 12) in order to store the data necessary for the operation.
H.

14H) (#224.#226). and,
1.3. In the same way for the fifth time, connect the output terminal (OP
2), (OP 3) is set to “Low” level (#22
8) The above is the difference from the flowchart shown in FIG. Figure 21 shows 7 of the calculations in this example.
0 - Show chart. It is basically the same as the 70-chart in the f514 diagram, but the only changes are transfers between registers that are no longer necessary and a few operations.

Table 4 corresponds to Table 3 and shows the relationship between the contents of lens data, the ROM addresses of the master lens and conversion lens, the RAM (register) designation of the microcontroller (MC3), and SW1 to SW5. be.

The present invention is not limited to the embodiments described above, but can take various forms. For example, in the above embodiment, calculations were performed using the funbarge thin lens and then transferred to the camera, but by increasing the number of serial inputs and outputs, all lens information of the master lens and conversion lens is transferred to the camera's microcontroller. It is also possible to output the data to the camera and have the camera perform all calculations according to the flow shown in FIG.

In addition, one contact point is added to the camera and the conversion lens, and the aperture value information calculated on the camera side and used for exposure control is sent to the conversion lens, and the conversion lens side calculates the effective value and controls based on this information. The depth of field may be determined using the aperture value. The calculation is based on the information (ΔAy) that indicates how many stops the control aperture value should be from the open aperture value (Avo + ΔAve).
is added to the above-mentioned open aperture value (Avo+ΔAve) to obtain the control aperture value (Avo+ΔAve+ΔAv). Also, the depth of field can be obtained by adding the above ΔAv. This information may be calculated on the camera side and transferred to the conversion lens.

In the above embodiments, everything is done electrically, but such information may also be calculated mechanically.

For example, on the master lens side, there is a length (
The conversion lens also has a bottle whose length corresponds to the shooting magnification, that is, a control ring for changing the shooting magnification. When bins of varying length are provided and a convergent lens is attached between the master lens and the camera, the two bins connect and push each other, and their vc becomes the composite focal length, or rt.
= β2·f, and then transmits it to the camera side, and also provides a bin that changes according to this length on the camera side, and detects this length to detect the combined focal length information. Further, even with a conversion lens, the combined focal length can be determined by detecting how much the conversion lens pin is pushed by the master lens pin.

If the above rt=β2·r is considered in a logarithmically compressed form, the combined focal length can be obtained by the sum, so it becomes easier if only the sum of the qualities is considered.

Regarding the display, it was arranged to be displayed only on the conversion lens, but it goes without saying that if the calculation is performed on the camera side, or when the content calculated on the convergence lens is sent to the camera side, it can be displayed on the camera side.

Furthermore, in the embodiment, a conversion lens is installed.
Although the calculation and display are shown only when X1 is applied, the calculation and display for obtaining each lens information may be performed and displayed even when only the master lens is attached.

Next, the present invention, which is useful for focusing IUI during macro photography, will be described in detail. Generally, in macro photography, focus adjustment is performed by manual operation of a distance ring or the like after determining the composition of the subject (that is, the photographing magnification).

For macro photography, a dedicated macro lens is used, a zoom lens equipped with a macro lens is used, and a macro converter or intermediate ring is installed between the master lens and the camera body. However, in either case, there is a limit to the range of m shadow distances in which focus can be adjusted, and focus adjustment may not be possible at the desired i shadow magnification. In such a case, the photographing distance between the subject and the camera must be changed to a distance that allows focus adjustment. In this modification, the display shows whether the camera should be moved closer to the subject or farther away. It is assumed that the camera to which this modification is applied is equipped with a focus and α detection device. A specific example thereof will be explained below based on FIG. 22 and FIG. 23.

First, for the camera body, in addition to the above-mentioned data, a signal indicating whether the lens is capable of focus detection, a signal indicating whether the current i-shadow state is in macro photography, etc. are sent to the camera body. A signal indicating the type and state of the lens is sent from the lens through the serial transfer described above. In this case, it is necessary to increase the number of serial transfers compared to the above embodiment. in particular,
For macro-dedicated lenses, the above lens type and status signals are sent directly to the camera body, and macro 8! ! With a two-conversion lens equipped with a macro converter, a signal is sent to the camera body in response to the switching of a switch that is linked to the switching operation for macro photography, and a macro converter sends a signal indicating information sent from the master lens to the camera body. It is sufficient if the logical sum with the signal in the macro converter is sent to the camera.

Table 5 shows the information signals output by each lens and the contents of the signals received within the camera. Here, for lenses that cannot detect focus, such as reflective telephoto lenses and macro converters, use b). “0” is stored in the lens, and “1” is stored in the lens whose focus can be detected. Further, when the lens is in the normal photographing state, "0" is stored in bit 1]1, and when the lens is in the macro photographing state, "1" is stored.

Next, the control circuit on the camera side is shown in FIG. In the figure, the focus detection circuit (300) outputs a 2-bit signal (signal a, 1)) indicating the in-focus state of the photographing lens to the camera-side microcomputer (MC,). Table 6 shows this signal and output contents.
Shown below. The microcomputer (MC4), like the microcomputer (MC, ) in Figure tjrJ1, performs serial data transfer with the lens, and also controls the focus detection circuit (300) and display device (310). In addition, display devices (
310), as shown in 70- of FIG. 23 described later,
The ○ mark in the middle indicates focus, and the ∆ marks on the left and right below it indicate front or rear focus.

FIG. 23 shows the microcomputer (MC,) 70-. In this explanation of 70-, only the parts that have been changed compared to the fjS13 diagram will be explained. First, before serial input/output of data is performed, the focus detection circuit (300) is turned on to start focus detection operation (number i is given (#301)).

Also, increase the number of serial input/outputs by one and set N=8 (#310>.

The lens information sent from the lens in step #314 (see Table 5) b). 1', when it is "0", that is, when focus cannot be detected, the vertical and horizontal Δ
Display the mark (#350). On the other hand, bit b is “1”
bit) J! is determined, and when it is “0”,
That is, during normal photography, steps #342 to #348 are displayed depending on the focus detection state. bit b
When 1 is "1", that is, when the macro 4Q shadow is in focus, only the center circle is displayed as in step #326, and if it is in the front bin, the upper circle is displayed as in step 7 well 328. Displays only the Δ mark of
Displays only the mark and points the camera away from the subject. If detection is not possible, it means that focus cannot be detected during macro photography, and upper and lower Δ marks are displayed as in step #332.

In addition, as you can see from the step showing the display state in figure f523, the display direction of the Δ mark indicating the surface bin and rear focus changes between the normal shooting state and the macro shooting state, such as horizontal direction and vertical direction, respectively. It is.

As a result, the in-focus state can be displayed in consideration of the normal or macro shooting state, so that the photographer can easily check the in-focus state. The display format shown in FIG. 23 is an example of this. For example, as shown in Table 7, Δ marks may be provided diagonally, and two of them may indicate the direction of out-of-focus.

Table 1 Person 2 Table 3 Table 4 As described above, according to the present invention, the shooting is determined by both lenses from the information specific or variable to the master lens and the information specific or variable to the conversion lens. Since the magnification, shooting distance, and depth of field are automatically calculated and displayed, the photographer can easily know the accurate values of these composite lens information and can shoot at the desired shooting magnification and shooting distance. This makes it easy to take pictures with the object in focus within the desired photographing distance range. Further, according to the embodiment of the present invention, since the calculation and display of composite lens information is performed within the conversion lens, the master lens is used less frequently when used together with the conversion lens than when used alone. Considering that calculation and display of the combined lens ↑n information is only necessary when combined use with a composite lens, it is more economical and rational than when calculation and display are performed on the master lens or camera body. It is.

[Brief explanation of drawings]

Figure i1 is a block diagram showing the circuit configuration of the camera system to which the present invention is applied, Figure 2 is a circuit diagram showing the main parts of the master lens in Figure fPJ1, Figures 13 and 1 to 15 are the conversion lenses in Figure 2. 6 is a flowchart showing the operation of the microcomputer in the camera body shown in FIG. 1, and FIG.
FIG. 10 is a perspective view and a plan view showing an example of the conversion lens, FIG. 10 is an external view showing an example of the display section in FIG.
1 is a circuit diagram showing another example of the circuit diagram in FIG. 3, FIGS. 12 to 14 are flowcharts showing the operation of the microcomputer in FIG. 11, and FIGS. 15 and 16 are 70- in FIG. 17 is a timing chart at 70- in FIG. 12, FIG. 18 is a diagram showing another example of the display section in FIG. 15, and FIG. The figure is a circuit diagram showing still another example of the circuit diagram in Figure 3, Figures 20 and 21 are 70-charts showing the operation of the microcomputer in Figure @19, and Figure 21 is the 70-chart in Figure 20.
Figure 21 is a block diagram showing the circuit configuration of the camera body in the case of fPJ19.
Fig. 2 is a block diagram of the main parts showing the circuit configuration of the camera body according to a modification of the present invention, Fig. 23 is a flowchart showing the main parts of the microcomputer 70- in Fig. 22, and Fig. 24 shows the master lens and the camera main body. FIG. 3 is a diagram showing an optical system when a conversion lens is inserted between the two. ML: master lens, CL: conversion lens,
CB: Camera body, 1-S: First information output means, 6-1
0: Second information output means, 11: Calculation means, 13: Display means Applicant: Minolta Camera Co., Ltd. Fig. 4 ANθ Fig. 5 S Lk Fig. 6 I1 Fig. 7 Fig. 2 Fig. 2 Fig. 1 θ Figure 1/Illustration 21 Figure 16 Figure 22

Claims (1)

[Scope of Claims] 1. In a camera system in which a conversion lens is selectively inserted between a master lens and a camera body, a first information output means that outputs information unique or variable to the master lens; a second information output means for outputting variable specific information or information to the conversion lens;
and the photographing magnification determined by the master lens and the conversion lens based on the information of the second information output means,
A lens information display device comprising a calculation means for calculating composite lens information of at least one of photographing distance and depth of field, and a display means for displaying the composite lens information calculated by the calculation means. 2. The lens information display device according to claim 1, wherein the first information output means is provided on the master lens, and the second information output means, calculation means, and display means are provided on the conversion lens.