JPS63286811A - Interchangeable lens group - Google Patents

Abstract

PURPOSE:To previously grasp accurately whether the function expected to a camera body can be exerted or not, by storing data related to aperture values and exit pupil diameters in the camera body in a fixed state. CONSTITUTION:A storing means 1 which stores data inherent to interchangeable lenses 11A, 11B,... in a fixed state, read signal inputting means 2 which inputs read signals from a camera body 5, and data sending-out means 3 which successively sends out the data of the storing means 1 to the camera body 5 in accordance with the read signals, are provided. The data stored in the storing means 1 in a fixed state contain at least data related to aperture values (for example, Avo, Avmax, DELTAAv1...) and data related to exit pupil diameters (for example, P0, P0', DELTAP0, DELTAP0'...). When, for example, the area to which focus detection is performed is expanded with a camera provided with an AF function, whether focus detection is possible or not in the expanded area can be discriminated strictly. Accordingly, an interchangeable lens group in which data necessary to improve the function of a camera body are stored in a fixed state can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an interchangeable lens group consisting of various interchangeable lenses each having fixedly stored data regarding aperture value and the like.

(Prior art) Conventionally, as an interchangeable lens group for single-lens reflex cameras equipped with TTL AE and AF functions, AerWI data such as open aperture value, maximum aperture value, and focal length, as well as lens extension amount conversion coefficients, etc. Many lenses have been developed in which the data of the AFlji series is fixedly stored so that it can be read by the camera body. However, the exit pupil diameter data is often estimated from the open aperture data, so
No lens has been proposed in which this data is fixedly stored together with the maximum aperture value.

(Problems to be Solved by the Invention) As mentioned above, among the interchangeable lens groups for single-lens reflex cameras, an interchangeable lens group in which data regarding the aperture value and data regarding the exit pupil diameter are fixedly stored has not been proposed. In order to improve the camera system, data on the exit pupil diameter will also be required. In order to determine whether focus detection is possible in the expanded area, it is necessary to strictly determine whether the light beam for focus detection is within the exit pupil plane of the interchangeable lens. However, for this determination, exact data on the exit pupil diameter is required, and data on the open aperture value may not be able to be used as a substitute. In addition, (1) when attempting to expand the group of interchangeable lenses, it becomes necessary to add, for example, a reflective telephoto lens in addition to normal refractive lenses. In this case, the shape of the exit pupil of a reflective telephoto lens is completely different from that of a normal refractive lens, and data on the open aperture value cannot be used as a substitute for data on the exit pupil diameter.

The present invention has been made in view of these points, and its purpose is to provide a fixed storage system for data essential for improving the functionality of a camera body and enriching a lens group, and to provide an exchange system that contributes to the development of camera systems. To provide a group of lenses.

(Means for Solving the Problems) As shown in FIG. 1, the interchangeable lens group according to the present invention includes a plurality of interchangeable lenses 11A, 11B, . . . All interchangeable lenses 11゛^,
11a, . . . are the respective interchangeable lenses 11^, 11B,
. . . storage means 1 that fixedly stores data specific to the camera body 5, read signal input means 2 that inputs the read signal from the camera body 5, and sequentially sends the data of the storage means 1 to the camera body 5 based on the read signal. The data fixedly stored in the storage means 1 includes at least data regarding the aperture value (for example, Avo, Aveia
x, ΔAv, -...) and exit pupil diameter data (for example, Po, Poo, ΔP0.ΔP0°, . . . ).

In the example shown in FIG. 1, the data regarding the exit pupil diameter is
In addition to the exit pupil outer diameter P, an exit pupil inner diameter P0' for regulating the inner exit pupil of a reflective lens is stored for each lens. For refractive interchangeable lenses ie, P
0°=0, but in the reflective interchangeable lens 11c, p
t+'>o. In addition, a zoom type interchangeable lens 110
Now, since the lens information changes according to zooming,
A zoom encoder 4D is provided as means 4 for outputting the state of the optical system.

(Function) In the interchangeable lens group according to the present invention, data regarding the exit pupil diameter is fixedly stored so that it can be read by the camera body.
For cameras equipped with Fl191, the relationship between the passband of the focus detection light flux determined by the camera body design and the exit pupil of the interchangeable lens can be strictly compared, and the focus detection area can be expanded more than before. In this case, it becomes possible to accurately determine whether focus detection is possible in that expanded area. In addition, for example, even when a reflective telephoto lens with an exit pupil shape different from that of a refractive lens is attached as an interchangeable lens, the camera body can accurately grasp data on the exit pupil diameter of the interchangeable lens. This eliminates the risk of malfunction.

(Example) - Fig. 2 is a diagram showing a schematic configuration of a multi-point distance measurement module installed in a single-lens reflex camera. A submirror 15 is a focus detection optical system. 22 is a field stop arranged near the focal plane, and has a rectangular opening 22a,
22b and 22c. 21a, 2 lb, 2
1e is a condenser lens, 20 is a module mirror, 1
8a, 18b, 18c are separator lens pairs, 16
m, 16b, and 16e are CCD image sensor arrays arranged on the focal plane 17 of the separator lens. One is an aperture mask, which has circular or oval openings 19a, 19b, 19c.
have. The image whose field of view is limited by the rectangular opening 22m passes through a condenser lens 21m, and is projected as two images onto the CCD image sensor array 16a by a field stop 19m and a pair of separator lenses 18m. When the distance between these two images is a predetermined distance, it is determined that the image is in focus, when it is narrower than the predetermined distance, it is determined that the front focus is on, and when it is wider than the predetermined distance, it is determined that the rear focus is on.

Similarly, the images of the field stops 19b and 19c are the condenser lenses 21b and 21c and the separator lens pair 18b.

18c, CCD image sensor arrays 1611, 16 . ! projected on top.

FIG. 3 shows a focus detection optical system 15a (a combination of a condenser lens 21m, a separator lens pair 18i, and a CCD image sensor array 16m) located above the optical axis 2 in FIG. The optical system 15b (a combination of a condenser lens 21b, a separator lens pair 18b, and a CCD image sensor array 16b) is extracted.

The distance measurement frames A and B are the focus detection frames shown on the film isometric plane F. Hereinafter, A will be referred to as an on-axis ranging frame, and B will be referred to as an off-axis ranging frame. In addition, ranging frames A and B are projected onto the object surface via the photographing lens 11, and A' and B will be referred to as ranging frames A' and B. '. On the exit pupil plane of the photographic lens 11, the separator lens pair 18a in the focus detection optical system 15m located on the axis is connected to the condenser lens 21m.
Images projected by 11a and 11b are shown by 11a and 11b. Images 11c and 11d are images of the separator lens pair 18b in the off-axis focus detection optical system 15b projected by the condenser lens 21b.

Figure 4 shows the exit pupil aperture of the taking lens at an arbitrary exit pupil position of the taking lens and the A that enters the focus detection optical system.
FIG. 3 is a diagram generally showing the positional relationship of the passband of the F light beam. 5 and 6 are diagrams for explaining AF pupil-related constants, which are determined by the design and arrangement of the focus detection optical system, among the parameters shown in FIG. 4. FIG. 5 shows the focus detection optical system 15a on the optical axis viewed from the direction of the arrow (y) in FIG.
) A similar diagram is obtained when the focus detection optical system 15b outside the optical axis is viewed from the direction. FIG. 6 is a view of the off-axis focus detection optical system 15b viewed from the direction of arrow (x).

Before entering into the following description, various parameters and constants used in FIGS. 4 to 6 will be explained.

In FIG. 4, Pz is the exit pupil position, which means the distance between the film equivalent plane F and the exit pupil plane of the predetermined photographic lens.

Po is the outer exit pupil radius at the exit pupil position Pz, and is hereinafter referred to as the exit pupil outer diameter.

ΔP0 is a parameter for correcting the shape of the outer exit pupil when viewed from a predetermined image height position, and is hereinafter referred to as outer exit pupil image height correction data (or r outer image height correction data for short). ”).

20' is used when the photographic lens is a reflective telephoto type.
Exit pupil radius for regulating the inner exit pupil, hereinafter referred to as exit pupil inner diameter, exit pupil outer diameter P0 and exit pupil inner diameter Po
′ are generally not necessarily located at the same exit pupil position, but in the following explanation, they are assumed to be located at the same position.

ΔP0° is a parameter for correcting the shape of the inner exit pupil when viewed from a predetermined image height position;
The shape of the exit pupil, which is called inner exit pupil image height correction data (or "inner image height correction data" for short), is usually circular, but as the image height on the film plane becomes higher, , the shape is close to an ellipse, as shown by the broken line in FIG. ΔP0 and ΔP0' are parameters for expressing the amount of change in shape.

AFP is an AP light flux area, which indicates a pass range of the AF light flux entering the focus detection optical system.

Ho indicates the amount of deviation of the AF light flux area AFP from the principal optical axis 2 of the photographing lens, and is set to the amount of deviation H0=0 in the case of the focus detection optical system 15a located on the optical axis.

ro indicates the size of the AF light flux area AFP at the exit pupil position Pz.

10 represents the distance between the two AF beam areas AFP at the exit pupil position Pz. This distance d0 is an amount that affects the detection sensitivity of the focus detection optical system, and is the distance Rd.

If the value is large, the focus detection sensitivity will be high, but a photographic lens with a small exit pupil diameter cannot be used.

Δd represents the amount of blur in the AF light flux area AFP in the focus detection optical system.

OUT is the outer pupil margin that the light beam incident on the focus detection optical system has with respect to the photographing lens, and is expressed by the following formula %Equation %Especially in the case of the focus detection optical system 15a on the axis, it is usually
1°=0, ΔP0=0, and OU Tz=P oro do−Δd/2.

IN is the inner pupil margin when the photographic lens is a reflective telephoto type, and is expressed by the following formula.

IN=T(HO+ΔP0°)”+(do−Δd/2)2
) I72r (IP6' Especially in the case of a 15m on-axis focus detection optical system, H0=0
, Δp,=o, and INz=do−Δd/2 ro po.

Depending on the sign of the outer and inner pupil margins JIOUT and IN, selection of a distance measurement frame and selection of a distance measurement area within the distance measurement frame, which will be described in detail later, are performed.

Next, in FIG. 5, a is the distance from the condenser lens 21a to the isoinclined plane F of the film.

t is the condenser lens 21& to the separator lens 1
8a (or the aperture mask 19a that is closest to the aperture mask 19a).

Ps is the position where the image (hereinafter referred to as "A It's called position.

O8 is a point on the optical axis at the AF pupil position Ps, and Qs
Qs' is the AF pupil aperture.

AF pupil position 'fl P s and AF@aperture QsQs' are
The power of the condenser lens 21a and the aforementioned distances a and t
is uniquely determined by design. Therefore, the distances MOsQs' and ○sQs from the point Os on the optical axis to the farthest point Qs and the nearest point Qs' of AF@aperture QsQs' can be regarded as constants. Furthermore, the size C1 of the distance measurement frame on the film isometric plane F and the inclination ω that the principal ray in the on-axis focus detection optical system 15a has with respect to the principal optical axis 2 of the photographing lens are also
Determined by design.

Incidentally, the amount of blur Δd in the AF beam area AFP explained in FIG. 4 is Δd> when the exit pupil position is farther or closer than the conjugate position of the separator lens or aperture mask predetermined by the focus detection optical system. It becomes O. This will be explained using FIG. 5. Separator lens 18a
If we follow the light rays from
At this time, each light ray shown by a dashed line, a solid line, and a broken line exiting from the center point R0 of the separator lens 18m passes through one point Rs=Rs', and the amount of blur Δd=o. Furthermore, when the exit pupil position Pz of the photographing lens is closer to the AF pupil position Ps (P z = P 21 < P s), the light ray shown by the solid line exits from the center point R0 of the separator lens 18a. passes through point R, the light ray indicated by the broken line passes through point R1°, and the light ray indicated by the one-dot chain line passes through the middle, so that the amount of blur Δd>0. Shooting lens exit pupil position P
When z is located at a point farther than the AF pupil position IPs (P
z = P zz > P s), separator lens 1
The ray shown by the solid line coming out from the center point R0 of 8a is the point R2
゛, the light ray indicated by the broken line passes through point R2, and the light ray indicated by the one-dot chain line passes through the middle, and the blur amount Δ
d>0. Note that here, in order to easily express the relationship between various parameters, it is assumed that the AF light flux regulation mask (aperture remask) of the focus detection optical system is circular.
Generally, it does not have to be circular.

Next, in FIG. 6, θ is the off-axis focus detection optical system 15.
The inclination of the principal ray ip with respect to the principal optical axis 2 in b, 11 is the amount of deviation of the off-axis ranging frame from the principal optical axis 2, and these also differ from the CCD image sensor array 16b and the separator lens 18.
b (and the aperture mask 19b in its immediate vicinity) and the geometric arrangement of the condenser lens 21b, so once the design of the camera body is completed, it becomes a unique constant.

Using the above constants, the parameter Ho explained in FIG.
, ro, and cl are expressed as follows.

First, the amount of deviation H0 of the AF light flux area AFP from the principal optical axis 2 of the photographing lens is expressed as H,=h-(Pz+a)tanθ. Here, the amount of deviation h of the principal optical axis 2 of the ranging frame, and the tilted plane F of the film from the condenser lens 21a.
As described above, the distance a and the inclination θ of the principal ray 1p with respect to the principal optical axis 2 are body information and are constants. The exit pupil position Pz is lens information and differs for each lens.

The size of the AF beam area AFP at the exit pupil position Pz is expressed as r, = l 0Q-OQ' l /2. Here, 0 is a point on the optical axis at the exit pupil position Pz. , Q is the point farthest from the optical axis of the AP light flux area AFP at the exit pupil position Pz, and Qo is the point closest to the optical axis of the AP light flux area AFP at the exit pupil position Pz.

When Pz=Pzl≦Ps, in FIG.
When Pz=Pzz>Ps, in FIG. 5, furthermore, the distance between the AF light flux areas AFP is represented by -.

In each of the above equations, 0sQs, 0sQs', Ps, and e are all body constants and are constant. Also, Pz=
Pz++Pzz is a value specific to each individual lens.

As is clear from the above, the outer and inner pupil margins OUT and IN are a series of body constants Os Q s .

0sQs', Ps, e and a series of lens information Pz, Pa
, Po'.

ΔP0. It is expressed by ΔP0°. By setting appropriate thresholds for the outer and inner pupil margins OUT and IN, selecting the distance measurement area within the on-axis and off-axis distance measurement frames,
Alternatively, it is possible to select a distance measurement frame when there are a plurality of distance measurement frames. To select the distance measurement area or distance measurement frame, select the outer and inner pupil margins OUT within the camera body.

Pz and P(1, POo, P,.

One possible method is to prepare a table in the camera body for selecting a distance measurement area by setting an appropriate threshold value for poo, but the following explanation will be based on the latter perspective.

First, an example of distance measurement area selection using a distance measurement frame located on the optical axis will be given.

Figure 7 shows the focus detection optical system 15M on the optical axis.
The vignetting situation of the luminous flux is expressed by various exit pupils P,,a.

Poa';Pob,Pob';Poc,Poe';Po
d and Pod'. Here, it is assumed that the exit pupils P ob and P ob' correspond to the AP pupil aperture QsQs' in FIG. Image A on film iso-inclined plane F. Bo is condenser lens 2
CC with 1a and separator lens 18m+, 18at
a A + B + and A z B on the D image sensor row
It forms an image as z. Point A + on the CCD image sensor array,
Considering the passband of light incident on B+, A*, B2, the light incident on point A is LA1~UAI,
The light incident on point B1 is LBI~UBI, the light incident on point A2 is LA2~UA2, and the light incident on point B2 is LB2~
It can be seen that it has a passband of UB2. AP@Aperture Qs
Exit pupil P coincident with Qs'. For b, p, b',
Naturally, no clarification of the AP luminous flux occurs.

Figure 8 shows exit pupils P, a, P, a'; Pob, Pob';
Poc.

In FIG. 8, which shows the element surface illuminance distribution on the CCD image sensor array corresponding to P oc': P lld, P od', the horizontal axis indicates the direction in which the elements of the CCD image sensor array are arranged. , the vertical axis indicates the illuminance on each element surface. It is assumed that an image AIB is formed on the right image sensor row R, and an image A t B 2 is formed on the left image sensor row. The image sensor row on the left has four distance measurement areas I~
■It is divided into areas.

When using a photographic lens having exit pupils p, b, p, and b', the outer exit pupil P. Also by b, the inner exit pupil P
Since ob' does not cause clutter in the AF light flux,
The element surface illuminance distribution becomes a uniform distribution E.

Therefore, in this case, all distance measurement areas (■) to (■) can be used.

Injection If! When using a photographic lens with Pea and Poa', the outer exit pupil P6m creates a blur between the luminous flux of UA2 and the luminous flux of UBI, so the illuminance of the element surface near the optical axis 2 decreases, resulting in a distribution like J. become. Also, the inner exit pupil P0. +, the luminous flux of LB2 and LAI
Since clarification occurs in the luminous flux, the illuminance of the element surface far from the optical axis 2 also decreases, resulting in a distribution G. Therefore, A
The distance measurement area that can be used without being affected by the clarity of the F light beam is ■.

Exit pupil P. c, when using a photographic lens with Poc', the outer exit pupil P. Luminous flux of UB2 and UA by C
Since clarification occurs in the luminous flux I, the illuminance on the element surface far from the optical axis 2 decreases, resulting in a distribution G. Furthermore, because of the inner exit pupils P and e', the luminous flux of LA2 and the luminous flux of LBI become blurred, so that the illuminance of the element surface near the optical axis 2 also decreases, resulting in a distribution J. Therefore, the distance measurement area that can be used without being affected by the clarity of the AF light beam is ■.

When using a photographic lens with exit pupils P ad and P ad', a large deviation occurs between the light flux of UB2 and the light flux of UAI due to the outer exit pupil Pod, so the optical axis 2
The attitude of the element plane farthest from is greatly reduced, and the distribution becomes like ■], and therefore the ranging area ■.

II and IV cannot be used, and the inner exit pupil P. d
′ causes a discrepancy between the LA2 luminous flux and the LBI luminous flux, and the illuminance of the element surface near the optical axis 2 also decreases, resulting in a distribution like J. Therefore, the distance measurement area ■ cannot be used either, and in the end, it cannot be used. There is no distance measurement area that can be used.

From this, tables such as Tables 1 to 4 can be created.

(Leaving space below) Table 1 (Selection table of on-axis distance measurement area from exit pupil position and exit pupil outer diameter) In the above table, Pz: Exit pupil position P s: A F pupil position Po: Exit pupil outer diameter■ ~■: Distance measurement area ×: Distance measurement impossible Table 2 (selection table of on-axis distance measurement area from exit pupil position and exit pupil inner diameter) In the above table, Pz: Exit pupil position Ps: AF pupil position Poo : Exit pupil inner diameter ■ ~ ■ : Distance measurement area × : Distance measurement impossible Table 3 (Selection table of off-axis distance measurement area from exit pupil position and modified exit pupil outer diameter) In the above table, Pz: Exit pupil position P s: A F pupil position po: Deformed exit pupil outer diameter I~■: Distance measurement area , Pz: Exit pupil position Ps: AF pupil position p0': Modified exit pupil inner diameter ■~■: Distance measurement area In Table 1, which shows an example of the distance measurement area selection table in the distance measurement frame, r, n, m, and i'v indicate the distance measurement areas, and × indicates that the illuminance distribution is large and the distance measurement is Po, ~P, indicating inability. 4. Pz+ to PZ4 are predetermined constants obtained from the above calculation formula. The above exit pupils p and b correspond to the case of Pz=Ps, P@b=OsQs, and the exit pupil Pea is P Z 3 < PZ < P 2
4. When P os < P oa < P 04, the exit pupil Poc is Pz+<PZ< PZ2. Po+
If < P oa < P ox, the exit pupil Pod is Pz
This applies when <Pz+ and Pod<Po+.

The distance measurement area for the non-reflective telephoto type can be selected from Table 1.

Further, Table 2 shows an example of a table for selecting a distance measurement area in an on-axis distance measurement frame from the exit pupil position Pz and the exit pupil inner diameter Po°, and shows the above-mentioned exit pupil P. bo is Pz=Ps, P
This applies when ob'=osQs', and the injection If! Pea
° is Pz3<Pz<Pz, Pos'<Pea'<Pe
In the case of n', the exit pupil P6c'' is PZI<PZ<PZ2
．． pH1'<Poc'<PO! In the case of °, the exit pupils P and d' are Pz<Pz.

In the case of a 9-reflection telephoto type that corresponds to P od'< P 0+", at a predetermined exit pupil position Pz, select the distance measurement area from the exit pupil outer diameter P0 using Table 1, and A distance measurement area is selected from the inner diameter P0 using Table 2, and a common distance measurement area for both of the selected distance measurement areas is finally determined.

Table 3 is an example of a table for selecting a distance measurement area in an off-axis distance measurement frame from the exit pupil position Pz and the modified exit pupil outer diameter p0. The modified exit pupil outer diameter p0 is on the axis (or near the axis)
Exit pupil outer diameter P0 when viewed from and outer image height correction data Δ
It is approximately determined by the following formula depending on P0 and a body constant that is partially dependent on the pupil position Pz.

P O"' P 6-k・ΔP0 (0≦to≦1)
Here, in FIG. 6, if the position where the principal light alp of the AP light flux intersects with the optical axis 2 is Pz"Ps (AF pupil position, constant), when Pz=Ps is near, then =o This shows that the AF light beam is not shifted with respect to the main optical axis 2, and that there is no influence of ΔP0 at the position where it is most likely to be clear (see Figure 4). or when Pz>PS, k approaches 1.

Generally, the AF light flux area AFP of the off-axis ranging frame is shifted from the optical axis 2, so k is a parameter that changes from 0 to 0.8. The meaning of the value itself is the AP light flux area AFP of the focus detection optical system located off the optical axis and the AF pupil position 5.
7P This is a coefficient for changing the weighting of ΔP0 when considering the margin with the exit pupil outer diameter P0 at the exit pupil position Pz, which is significantly different from s.

The modified exit pupil outer diameter p0 defined in this way is used for determining the distance measurement area only in the off-axis distance measurement frame. That-
An example is shown in Table 3. The major differences from the selection of the distance measurement area in the on-axis distance measurement frame shown in Table 1 are: ■For a photographic lens with a small exit pupil position 771 Pz, even if the modified exit pupil outer diameter p0 is large. The AP luminous flux should be clear.

■Also, for a photographic lens whose exit pupil position Pz is far away from the AP pupil position Ps, the AF light flux will deviate greatly off-axis as shown in Figure 6, and the k value itself will also become large. The point is that it becomes easier to clarify.

Regarding the exit pupil inner diameter P0° for selecting the off-axis distance measurement area, the modified exit pupil inner diameter p0° is defined as P o' ” P
A similar argument can be made by defining 0'+ as '・ΔP0° (0≦≦1) and replacing the above P(1 with p0゛. Table 4 shows the exit pupil position Pz and the modified exit It is an example of the selection table of the distance measurement area in the off-axis distance measurement frame from the pupil inner diameter p0°.

FIG. 9 is a circuit diagram of a camera system to which the present invention is applied. (DT) is a light receiving part for focus detection, and 1 in Fig. 2
It has CCD image sensor arrays indicated by 6m, 16b, and 16c. (rpc) is an interface circuit that controls the operation of the CCD image sensor array, A/D converts the signal read from the CCD image sensor array, and transmits it to the microcontroller (COM) via the data bus (DBAF). and a function to transmit the completion of the charge accumulation operation of the CCD image sensor array to the interrupt input terminal (INT'+) of the microcomputer (COM). Note that the charge accumulation time in the CCD image sensor array is controlled by the output of a light receiving section (not shown) that monitors the brightness of the subject.

(MOA F > is the lens drive motor for the AP, (MDA) is the motor control circuit, and the microcomputer (CO
Controls forward rotation, reverse rotation, brake, and OFF using signals from output boats (po) and (pl) of M> (DPA)
is the output port (p-) of the microcontroller (COM>), (p
This is a display unit for displaying the direction of movement of the lens, focus, and focus detection failure warning degrees based on signals from ().

(ENL) is an encoder that outputs a pulse to monitor the amount of lens drive (motor rotation Jl) by the lens drive motor (MOAF>), and (ENAP) outputs a pulse to monitor the amount of aperture of the lens. (SEC) is an encoder for AP (EN
The microcomputer (COM) is a data selector that sends pulses from L) to the event counter input terminal (CNTR), and pulses from the aperture encoder (ENAP) when the level is "Higb" to the event counter input terminal (CNTR). An event counter is provided internally, data is preset in the event counter, and the contents of the event counter are counted down every time a pulse is input to the terminal (CNTR). When the contents of the event counter reach O, an interrupt is generated. It takes.

(S,) is a photometry switch that is closed at the first step of pressing the release button, and the closing signal of this photometry switch (S +) is sent to the interrupt input terminal (INT,
) and is input to the input boat (p, ). (82) is a release switch that is closed in the second step of pressing the release button, and the closing signal of this release switch (S2) is as follows.
It is input to the input boat (p6). (S is exposure control
It is a reset switch that is closed when the operation is completed and opened when the winding/charging is completed, and the closing signal of this reset switch (S,) is input to the input port (p)).

(GV) is a power supply circuit, which operates when the power supply control signal (pwc) output from the output port (pl) is at "Low" level. This power supply circuit (GV) is a power supply battery (
High voltage (HV) and low voltage (BA) based on the output of
LV). High voltage (HV)
) and interface circuit (IFC). Also, low voltage (LV) is applied to the display section (DPA), encoder (ENL), (ENAP), data selector (S
EC), and the film sensitivity reading circuit (ISD) described below.
, lens circuit (LEC), photometry and A/D conversion circuit (MEC), decoder/driver (DDR), motor control circuit (MDA), (MDF>, display unit (DSP), microcontroller) (COM) is a power supply battery (BA
) receives power directly from the power supply line (EV>).

(ISD) is a film sensitivity reading circuit that reads the ISO data indicating the film sensitivity on the film container, and when the film devil reading circuit selection signal (C3IS) from the output port (ps) goes to "Low" level, the microcontroller (
Film sensitivity data is input to the serial input terminal (SIN) in synchronization with the serial clock (SCK) from the serial clock (SCK) from
) serially. (LEC) is a lens circuit provided within the interchangeable lens. This lens circuit (LEC
) has a circuit configuration disclosed in, for example, Japanese Unexamined Patent Publication No. 59-140408, and the output port (p+.

) Lens circuit selection signal (C8L) from ``Low''
When the level is reached, various data stored in the ROM in the lens circuit (LEC) are serially sent to the serial input terminal (SIN) in synchronization with the serial clock (SCK). Here, R in the lens circuit (LEC)
The data fixedly stored in the OM will be explained separately for fixed focus lenses and zoom lenses.

(Leaving space below) Table 5 (Memory contents of the ROM inside the lens of a fixed focus lens) Table 6 (Storage contents of the ROM inside the lens of a zoom lens) Table 5 is for a fixed focus lens, and Table 6 is for a zoom lens. The contents stored in the ROM inside the lens are shown. address 0
1 contains the data common to all lenses as the mounting signal (IC).
It is fixedly stored as P). Address 02 is the open aperture value (Avo), address 03 is the maximum aperture value (Avo), and address 03 is the maximum aperture value (Avo).
vmax) is fixedly stored. A zoom lens whose aperture value changes with zooming has a fixed memory of the aperture value at the shortest focal length. Also, in the case of a reflective telephoto lens, the aperture is fixed, so A vo = A vm
It is ax. Focal length (f) data is stored at address 04 in the case of a fixed focus lens, and at addresses 10 to IF in the case of a zoom lens. In addition, in the case of a zoom lens, the lower four bits 0 to F of 10 or more addresses are addressed by a signal obtained from a zoom encoder in accordance with zooming. At address 05 or addresses 20 to 2F, there is a coefficient (K) that converts the defocus amount to the drive amount of the lens drive motor (MOA F ).
is memorized. address 06 or address 30-3
F stores data on the amount of aperture change (ΔAv) associated with zooming, and in the case of a fixed focus lens, ΔA v
= O. address 07 or address 40~
Data on the exit pupil position W (Pz) is stored in 4F, and data on the exit pupil outer diameter (Po) is stored in addresses 08 or 50 to 5F. Address 09 is the exit pupil inner diameter (Pa
') data is stored, and is Po""O for lenses other than reflective telephoto lenses. Address OA or addresses 60 to 6F store external image height correction data ΔP0, address OB stores internal image height correction data ΔPa', and for lenses other than reflective telephoto lenses, internal image height correction data ΔP0'' =0.

(DSP) is a display circuit, which performs display based on display data sent from a microcomputer (COM).

(M E C") is a photometry and A/D conversion circuit, and when low voltage (LV) power supply from the power supply circuit (GV) starts, it starts photometry operation and outputs the output port (p, - )
A/D conversion enable signal (ADEN) from
When the level is reached, A/D conversion is delayed at a constant cycle. Then, when the photometry and A/D conversion circuit selection signal (CSME) from the output port (p,) becomes “Low” level, the A/D converted and latched data is synchronized with the serial clock (SCK). Microcomputer (COM)
sent to. (DDR) is a load driving circuit, which decodes data sent from the microcomputer (COM) through the data bus (DBDR) and drives the load according to the decoded result.

The loads include a release magnet (RLM), an aperture control magnet (APM), and a leading curtain control magnet (
ICM), rear curtain control magnet (2CM), film advance and exposure control mechanism charge motor (MOCH)
and its driver (MDF).

X is an oscillator.

The operation of this camera system will be explained below based on the flowcharts shown in FIGS. 10 to 16. In the following description, the symbol "#" means a step number of the program. When the release button is operated, the photometry switch (Sl) is closed by pressing the first step, an interrupt signal is input to the interrupt input terminal (INTO), and the microcomputer (COM> The operation starts from the input routine INT, l. First, the power supply control signal (PWC) output from the output port (p6) is set to the °'L, o*" level, and the power supply circuit (aV) is operated ( #1), then interface circuit (IFC), display circuit (DSP)
), outputs the reference clock ° (CKOUT) to the photometry and A/D conversion circuit (MEC), and performs a CCD initialization operation to flush out the charge accumulated in the CCD (#
2゜#3) 0 Next, start the charge accumulation operation of the CCD, and when the charge accumulation operation ends, interrupt input terminal (■NT,)
The A/D conversion enable signal (ADEN) from the output port (+) 12) is set to low level, and the photometric value is A/D converted (#4゜#5., #
6).

Next, the process moves to the photometry routine, and lens data is acquired from the interchangeable lens, and film sensitivity data (IS) is acquired from the film container.
0 data) respectively (#7, #8), then,
The states of the flags IFF+ and IFF2 are determined. IFF+is a flag that is set to 1 when the fish state is reached, and IFF2 is a flag that is set when photometric data is taken in after the state is reached as a goldfish state.

Therefore, when the goldfish is not in focus or when the photometric data is not captured even if the goldfish is in focus, the photometric data is captured, and when the data is captured after focusing, the flag IFF2 is set to 1, and the calculation routine is executed. Transition. Also, the flags IFF+, IPF2
If both are 1, proceed directly to the calculation routine without inputting photometric data (#9 to #13)
.

In the calculation routine, first, in step #14, it is determined whether or not the lens attachment signal ICP is input. If so, the process moves to step #15, and if not, the process moves to step #16. In step #15, the open aperture value Avo is equal to the maximum aperture value Avma (Avo=A
vs+a), and if it is a reflective telephoto lens, Avo=Avmax, so #16, Avo≠A v
If it is max, it is a normal interchangeable lens, so move on to step #19. First of all, of course, when no lens is attached and when a reflective telephoto lens is attached,
Aperture control is not possible and the aperture must be considered fixed.

Therefore, in step #16, (photometric data) = Bv
-Av (By is subject brightness, Av is fixed aperture value) and ISO value Sv indicating film sensitivity is added to calculate rrfITv at exposure. Then, in step #17, it is determined whether or not a lens is attached. If a lens is not attached, the exposure time is displayed in step #18, and the F value is displayed as a warning (for example, "--"). , on the other hand, if the lens is attached, it is a reflective telephoto lens,
The calculated exposure time Tv and fixed aperture value (If1g maximum aperture value Avo=maximum aperture value A vmax) are displayed in step #21. When it is determined in step #15 that it is not a reflective telephoto lens, in step #19, (photometric data) = Bv - (Avo + ΔAy), Avo + ΔA
The exposure value Ev is calculated by adding v+Sv, and this exposure value E
By performing a 10-gram exposure calculation (#20) based on v, the aperture value Av and exposure time Tv are calculated and displayed (#21).

When the above operations are completed, flag AEF is set to 1. This flag is a flag that is set to 1 when the exposure calculation is completed. Next, determine the state of the flag CF,
If CF=1, the process moves to the AF routine. This flag C
When the charge accumulation operation of the COD is completed during the operation of the photometry routine or calculation routine, if no exposure calculation has been completed, F will import the data from the COD and then perform the remaining exposure calculations. and then transition from this step to the AP routine.

In step #24, it is determined whether the release switch (S,) is closed, and in step #25, it is determined whether the exposure control value has been calculated from the photometry data after focusing. If so, the camera shifts to the exposure routine and performs exposure control operations.

On the other hand, if the conditions are not met, it is determined whether the photometry switch (Sl) is closed in step #251, and if it is closed, the process returns to the photometry routine, and if it is not closed, the stop routine is executed. perform the following actions.

In the stop routine, first, all flags are reset and the output port (p,) is set to "Los" level.
Sends data to set the display to 0FF (no display) to the display circuit (DSP), stops the motor (MOAF), stops the output of the reference clock (CKOUT), and deactivates the power supply circuit (GV). and set the signal (ADEN) to Hi.
gh” level, A/D conversion is disabled, and the microcomputer (
COM) stops operating (#26 to #32).

Next, the operation of the AF routine will be explained using FIG. 11. When the storage operation of the CCD is completed, an interrupt input signal is input from the interface circuit (IFC) to the interrupt input terminal (INT), and the operation similar to #39 is performed.
In step #39, determine whether an interchangeable lens is attached, and if it is, go to step #40.
If it is not installed, proceed to the operation from #51 described later, and
In step #40, data acquisition from OD, focus detection, lens drive operation, etc. are not performed.
) The analog signals corresponding to the three columns of CCDs output from the interface circuit (IFC) are sequentially A/
Convert it to D and import it into the microcomputer (COM), and
Set flag CF to 1, determine whether flag AEF is set to 1, and if flag AEF is 0, the first photometry routine and calculation routine have not finished, so return address Return to (execution step when INT interrupt occurs). Then, when the photometry routine and calculation routine are completed, CF=1 is determined in step #23, and the process returns to the AF routine. #42
If AEF=1 in step , the process moves to the AP routine immediately after the capture of COD data is completed.

In the AF routine, first, set the flag CF to 0.
The process moves to subroutine 5UB1 shown in FIG. 13. In this subroutine 5UB1, a distance measurement area where the focus can be detected is selected in the on-axis distance measurement frame A based on the exit pupil position Pz and the exit pupil outer diameter P. Next, in step #44, the lens Exit pupil outer diameter P0 and outer image height correction data Δ
Off-axis ranging frame B from P0 and camera body constant k
, C. Next, the process moves to subroutine 5UB2 shown in FIG. 14, and the off-axis 8m distance frame B, based on the exit pupil position Pz and the modified exit pupil outer diameter p0, is calculated. Next, in step #45, the exit pupil inner diameter P0°=
If P0°=0, it is a normal lens, and the process immediately moves to step #47. On the other hand, Po
“If ≠0, it is a reflective telephoto lens, and the process moves to subroutine 5UB3 shown in FIG. 15. Subroutine 5UB3
Now, based on the data of the exit pupil position Pz and the data of the exit pupil inner diameter Po°, select a distance measurement area in the on-axis distance measurement frame A in which the focus can be detected. , this subroutine 5UB3 also determines the distance measurement area selected in the 0th order, #
In step 46, the modified exit pupil inner diameter p0° is calculated from the exit pupil inner diameter P0° from the lens, the internal image height correction data ΔPo°, and the constant of the camera body.6 Next, the process moves to subroutine 5UB4 shown in FIG. 16. Then, a detectable distance measurement area is selected from the off-axis distance measurement frames B and C based on the exit pupil position Pz and the modified exit pupil inner diameter p0°, and the subroutine 5U
Selected in B2, and this subroutine 5U
Also in n4, the distance measurement area to be selected is finally determined.

In step #47, data Pz, P regarding exit pupils are
o, Po°, p, p0", and if there are none, the process moves to step #51 without performing focus detection.On the other hand, if even one is selected. If there is a selected distance measurement area, perform focus detection (defocus amount detection) for each selected distance measurement area (
#48) Then, it is determined whether reliable data is obtained for each ranging area, and if all the data is unreliable, the process moves to step #51 (#4
In steps #9, #50) and #51, the flag IFF snow is set to 1. This is so that when focus detection is not possible, exposure control operations can be performed regardless of whether or not focus is detected.Also, a warning is displayed that detection is not possible, and the CCD accumulation operation is activated. The process starts, allows the interrupt of lNTl, and returns to the return address in the photometry routine and calculation routine.

If it is determined in step #50 that at least one piece of reliable data has been obtained, the process moves to step #60 and performs statistical processing. For example, when a plurality of data are within a predetermined defocus value of 1, a defocus amount is adopted such that the plurality of objects fall within the depth of focus. Then, it is determined whether the defocus amount determined by statistical processing is within the in-focus area, and if it is outside the goldfish area, the process proceeds to step #62, and if it is within the in-focus area, the process proceeds to step #70. In step #62, the defocus direction is displayed,
Calculate the drive amount of the lens drive motor (MOAF) by multiplying the defocus amount by the conversion coefficient (K) #63), and preset this drive amount in the event counter (EVC') (#64). Then, the event force and counter interrupt are enabled (#65), the lens drive motor (M
OA F ) is operated (#66).

Then, the process returns to the return address of the photometry routine and calculation routine. Thereafter, while driving the lens, the photometry routine and the calculation routine are repeated, and the pulse from the encoder (ENL) that monitors the amount of lens drive is sent to the selector (S
The data is input to the event counter from the terminal (CNTR) via the terminal (EC), and the contents of the event counter are decremented.

When the content of the event counter reaches 0, an interrupt (EVC interrupt) is generated by the event counter, #1 in Figure 12.
Perform the operation from step 00.

In step #100, it is determined whether AP is in operation or not. In this case, AF is in operation, so the process moves to step #101 to stop the motor (MOAF) and perform focus detection for confirmation. , after starting the accumulation operation of the CCD (#102) and enabling interrupts from the interrupt input terminal INT (#103), the process proceeds to the photometry routine from step #7. Note that step #104 will be described later.

In the flow of FIG. 11, when it is determined that the focus is achieved at step #61, the light moves to step #70,
In-focus display is performed, and flag I is set in step #71.
Set FF to 1 and proceed to the photometry routine from step #7. Therefore, once the in-focus state is confirmed, focus detection and lens driving will not be performed thereafter as long as the photometry switch (Sl) is closed.

At step #24 in Fig. 10, press the release switch (S
2) is closed and 1 is set in the flag IFF in step #25, the process moves to the exposure control routine shown in FIG. First, set the AP display to 0 in step #75.
FFL, use the release magnet (RL) at step #76.
M) to start the operation of the exposure control mechanism. Then, it is determined whether an interchangeable lens is attached and whether a reflective telephoto lens is attached (#77, #78) L
, If no lens is attached or a reflective telephoto lens is attached, the process moves to step #83 and no aperture control operation is performed.On the other hand, if a normal lens is attached, first step #79 is performed. Control aperture lit! (AV'
) is equal to the open aperture value (Avo),
If A v = A y6, the process similarly moves to step #83. On the other hand, if it is Av#Avo, set the number of aperture steps (Av-Avo) in the event counter (EV C), set the port (p-) to the "High" level, and then output from the encoder (ENAP) that monitors the aperture amount. pulses are output from the selector (SEC) (#80. #81. #82), and #83, #
Wait for a certain period of time in step 84. During this time, the narrowing down operation is performed and if an event counter interrupt occurs, #1
In step 04, the aperture magnet (APM) is operated to stop the aperture. Then, after a certain period of time has elapsed, the reflection mirror has finished rising, and the front curtain magnet (ICM) is operated to start running the front curtain and count the exposure time (#85, #86). , When the count is completed, operate the trailing curtain magnet (2CM) to start running the trailing curtain (#87), and wait until the running of the trailing curtain is completed and the reset switch (S, ) is turned ON. Wait (I88). When the reset switch (S, ) is turned on, the charging motor (MOCH) is operated to wind the film and charge the exposure control mechanism.
When this operation is completed, the reset switch (S,) is turned OFF.
Wait until it becomes (#89).

I90>, and the reset switch (S,) is OFF.
, wait until the release button is released and the metering switch (S, ) turns OFF (I91). When the metering switch (Sl) turns OFF, the stop routine is performed, and then the metering switch is turned OFF. (Sl) is turned ON, the microcomputer (COM) is activated, and the operation stops until the time comes.

Subroutine SUB 1.5OB2 shown in FIG.
The specific contents of 5UB3 and 5UB4 are shown in Figures 13 and 14.
In the subroutine 5uet of FIG. 13, which is shown in FIGS.
A distance measurement area is selected from the on-axis distance measurement frame A based on Pz and exit pupil outer diameter P0. First, in step I110, it is determined that P o < P o +, and when Po<Po+, there is no detectable ranging frame, and the process moves to step I128.

On the other hand, P0≧P0. Then, in step I111, P o < P o a is determined, and P ox > P o
≧P0. If so, Yl+ is set as the address in step I112.

Similarly, in step I113, P ox > P
If 0≧Po2, set Yl2 as the address in step I114, and set p, ,>p in step I115.

If ≧PO3, Y3. is set as the address, and if P0≧P0° at step I115, Yl is set as the address at step I117.

Next, the exit pupil position Pz is also determined in the same manner according to Table 1, and if Pz≧Pz at step I118, the process moves to step I128, and at step I118, P Z4>P z≧ If Pzs, set X to the address in step I120, and if PZs>Pz≧Pz2 in step I121, set X in step I122.
l, as the address, and PX3 in step I123.
If >PZ≧Pz+, set XI2 as the address in step I124, and set PZ+ in step I123.
If Pz, set Xll as the address in step I125. As a result, the position in Table 1 can be set using the address data (Xll, Yl), and the ROM table in which Table 1 is stored can be specified with this address data (Xll, Yl). Set the data of the distance measurement area where the focus can be detected, which is stored in the register ERAR.This data is 4-bit data corresponding to the distance measurement areas ■ to ■. The corresponding bit is 1, and the bit corresponding to the ranging area where focus detection is not possible is 0. Therefore, for example, address data (X + +, Y +
1) is specified, “0001” or “0011”
data, address data (X I 4, Y, Ko)
is specified, data of 0001" or 1001",
When address data (Xll, Yl4) is specified, 1
111'' is set in the register ERAR.In addition, in step I128, since there is no distance measurement area where the focus can be detected, the register ERAR is set to ``000''.
0'' is set.

The subroutine 5UB2 in FIG. 14 is a flow for selecting a focus detectable distance measurement area from the off-axis distance measurement frames B and C from the exit pupil position fiPz and the modified exit pupil outer diameter p0 according to Table 3. . Subroutine 5UB in Figure 13
Similar to I, P o < P o at step I130
+ or at step I138 Pz≧PZ4
In this case, there is no distance measurement area where the focus can be detected, so 0000 m is set in the register ERBCR. Furthermore, I13
In step 1, p01≦p 0(p, 2, then I1
In step 32, set Y2+ to address and I133
In the step of p. 2≦Po<P. , then set Yl2 to the address in step I134, and set po in step I135, if ≦Ts o< fs o, then I13
Y2 in step 6. is set as the address, and if p, . Furthermore, if Pzko≦Pz<Pz in step I139, set X24 as an address in step I140, set Pz in step I141, and set X1s as an address in step I142 if ≦Pz<Pz s. If Pz+≦PZ<PZ2 in step #143, set X22 as the address in step #144, and set PZ2 in step #143.
If Z+>Pz, set X2I as the address in step #145. Then, the set address (X 2
1, Y z r ) to specify the ROM table, and store the data stored at that address in register ERBC.
Set to H.

In the subroutine 5UB3 shown in FIG. 15, a focus detection area in the on-axis distance measurement frame A is selected from the exit pupil position Pz and the exit pupil inner diameter P0'' according to Table 2, and finally, , a distance measurement area in which the focus can be detected is selected using the on-axis distance measurement frame A determined from both the exit pupil outer diameter Po and the exit pupil inner diameter P0°. First, according to Table 2, address data (X31.YjI) is set (#
151 to #166), and this address data (X
31゜YjI) specifies the ROM table, reads the data stored at that address, and writes this data and the register ERAR already in subroutine SUB 1.
The logical AND with the data set in is performed for each bit, and the result is set in register ERAR. As a result, even if one bit is selected and the bit corresponding to that distance measurement area is 1, if the other bit is O, that bit becomes O,
Exit pupil outer diameter P. , and the exit pupil inner diameter P0'' are set in the register ERAR.

Note that P, ≧P0.゛or when Pz<Pz+, there is no ranging area where the focus can be detected, so the register ERAR
is set to “oooo”.

In subroutine 5UB4 in FIG. 16, a focus detection area is selected from the off-axis distance measurement frames B and C based on the exit pupil position Pz and the modified exit pupil inner diameter p0° according to Table 4, and the final Specifically, the modified exit pupil outer diameter p and the modified exit pupil inner diameter P. A distance measurement area in which the focus can be detected using off-axis distance measurement frames B and C is selected from both of . First, similar to subroutines 5UB1 to 5UB3 in FIGS. 13 to 15,
Address data (X41.Y41) is set according to the size of p, ", Pz, and this address data (X41.Y41)
41) specifies the ROM table, reads the data stored at this address, and performs the logical product of this data and the data already set in the register ERBCR in subroutine 5UB2 for each bit. By setting in the register ERBCR, the distance measurement area where the focus can be finally detected is set. Note that p0°≧
p0. When the angle is 0.degree., there is no distance measurement area where the focus can be detected, so 0000'' is set in the register ERBCH.

In the above embodiment, eight on-axis ranging frames and off-axis ranging frames B and C are provided as ranging frames, and each ranging frame A, B, and C is assigned to the ranging areas ■ to ■. Although it is divided into areas, the distance measurement frame 11 is, for example, the distance measurement frame! , A, and B, or only distance measurement frames A and C.Also, only distance measurement frame A may be used, and distance measurement frame A may be divided into areas as in the embodiment, or three measurement frames may be used. It may be configured such that distance frames A, B, and C are provided, and distance measurement frame A is divided into regions, while distance measurement frames B and C are not divided into regions.

As exposure control modes, only P mode (program exposure mode) is shown, but A mode (aperture priority AE mode), S mode (shutter speed priority AE mode),
Even in M mode (manual mode), when a reflective telephoto lens is attached, different measures are required than when using a normal lens. That is, in A mode, the exposure time is automatically set for a fixed aperture as in P mode, and in S mode or M mode, the exposure time is set for a fixed aperture.

In the description of the above embodiments, as an example of changing exit pupil diameter data in conjunction with changes in the optical system of an interchangeable lens,
In the case of a zoom lens, we have shown an example of changing the exit pupil diameter data in conjunction with zooming. It may be configured as follows.

(Effects of the Invention) In the interchangeable lens group according to the present invention, data related to the aperture value and data related to the exit pupil diameter, which are essential for improving the functionality of the camera body and enriching the lens group, are both fixedly stored. Since data is not substituted with other data, the effect is that it is possible to accurately grasp in advance whether or not the camera body will be able to fully demonstrate its intended functions. This has the effect of ensuring the expandability of the system.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of the present invention, FIG. 2 is a perspective view of a focus detection device used with an interchangeable lens group according to an embodiment of the present invention, and FIG. 3 is a perspective view showing the configuration of the main parts of the same. FIG. 4 is an explanatory diagram of the exit pupil plane of the same interchangeable lens, FIG. 5 is an explanatory diagram of pupil-related constants in the same focus detection device, and FIG. 6 is an explanatory diagram of the off-axis focus detection optical system used in the above, FIG. 7 is an explanatory diagram of the axial focus detection optical system used in the same as above, FIG. 8 is a diagram showing the illuminance distribution on the CCD image sensor array used in the same as above, and FIG.
The figure is a circuit diagram of a camera system using the same interchangeable lens group, and FIGS. 10 to 16 are flowcharts for explaining the operation of the same. 1 is a storage means, 2 is a read signal input means, 3 is a data sending means, and IIA, 11B, . . . are interchangeable lenses.

Claims (4)

[Claims] (1) An interchangeable lens group including a plurality of interchangeable lenses,
All interchangeable lenses have a storage means that fixedly stores data specific to each interchangeable lens, a means for inputting a reading signal from the camera body, and a means for sequentially sending data from the storage means to the camera body based on the reading signal. 1. An interchangeable lens group, wherein the data fixedly stored in the storage means includes at least data regarding an aperture value and data regarding an exit pupil diameter. (2) Data regarding the exit pupil diameter includes data on the exit pupil outer diameter and the exit pupil inner diameter, and the exit pupil inner diameter data is 0 for a refractive lens and 0 corresponding to that lens for a reflective lens. 2. The interchangeable lens group according to claim 1, wherein data corresponding to a predetermined value other than the predetermined value is stored. (3) The interchangeable lens group according to claim 1, wherein the data fixedly stored in the storage means includes data on exit pupil position. (4) The plurality of interchangeable lenses include an interchangeable lens in which the state of the optical system can change, and the interchangeable lens is further provided with means for outputting data indicating the state of the optical system, and the interchangeable lens is further provided with means for outputting data indicating the state of the optical system. The storage means of the lens stores data on exit pupil diameters corresponding to the state of the optical system, and the means for sequentially transmitting the data in the storage means selects the exit pupil diameter selected according to the data indicating the state of the optical system. 2. The interchangeable lens group according to claim 1, further comprising means for transmitting diameter data.