JPS6334524A - Camera - Google Patents

Abstract

PURPOSE:To enable easy photographing at 3 different focal lengths with just one unit of camera by providing a main lens, 1st auxiliary lens and 2nd auxiliary lens to the camera. CONSTITUTION:The two auxiliary lenses 15, 16 which realize the focal lengths respectively different from the focal length of the main lens 8 by cooperating with the main lens 8 are mounted to a movable lens-barrel 7. The 1st auxiliary lens 15 is inserted into the rear photographing optical path of the main lens 8 in the state in which the main lens 8 supported by the movable lens-barrel 7 is positioned furthest from the film plane F to realize the long focal length longer than the focal length of the main lens 8 by cooperating with the main lens 8. The 2nd auxiliary lens 16 is inserted into the rear photographing optical path of the main lens 8 in the state in which the main lens 8 supported by the movable lens-barrel 7 is positioned nearest the film plane F to realize the short focal length shorter than the focal length of the main lens 8 by cooperating with the main lens 8. The photographing at the focal lengths varied in 3 stages is thereby easily executed simply by operating a focal length selecting mechanism.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention comprises a main lens and a sub-lens that is interposed in the photographing optical path of the main lens and achieves a focal length different from that of the main lens. The present invention relates to a camera with which the focal length of the affected lens can be changed in multiple stages.

[Conventional technology]

The above-mentioned cameras allow you to easily take pictures with different perspectives and compositions at different focal lengths using a single camera. As something that can measure the diversification of expression,
Various types have been developed.

As this type of camera, a so-called bifocal camera in which the focal length can be changed in two stages is conventionally known. This bifocal camera is one that can perform standard photography and wide-angle photography by having a sub-lens work together with the main lens to achieve a short focal length shorter than the focal length of the main lens (for example, 100327), or one in which the sub-lens cooperates with the main lens to realize a long focal length longer than the focal length of the main lens, allowing standard photography and telephoto photography (for example, Japanese Patent Laid-Open No. 61 -Refer to Publication No. 32828)
There is.

[Problem that the invention seeks to solve]

However, in the conventional configurations described above, the focal length of the photographic lens is changed in two steps, and changes in perspective and composition are also limited.

On the other hand, when actually taking pictures, it is easy to take pictures with the best shot that suits various shooting situations, such as close-up shots of people, group shots, or long shots of scenery. It is desired to do so.

In view of the above-mentioned circumstances, an object of the present invention is to provide a camera that allows for further diversification of expression through simple operations.

[Means for solving problems]

The camera according to the present invention has a characteristic configuration including a main lens, a first sub-lens that cooperates with the lens to achieve a long focal length longer than the focal length of the main lens, and a first sub-lens that cooperates with the main lens. and a second sub-lens realizing a short focal length shorter than the focal length of the main lens, and an intermediate focal length state in which both the first sub-lens and the second sub-lens are retracted from the photographing optical path. and a focal length that selectively switches between a long focal length state in which the first sub-lens is located in the optical path and a short focal length state in which the second sub-lens is located in the photographing optical path. The reason is that a switching mechanism is provided.

[For production]

In other words, for example, standard photography can be performed using the main lens alone as a standard lens, telephoto photography can be performed by aligning the optical axis of the first sub-lens with the optical axis of the main lens, and
Wide-angle shooting is possible by aligning the optical axis of the secondary lens with the optical axis of the main lens. Shooting with three different focal lengths is now possible simply by operating the focal length switching mechanism. I can do it.

By the way, as a structure for changing the focal length in three steps in this way, various structures can be considered as listed below. For convenience, regardless of the film size,
Photography using three different focal lengths will be described in order from the shortest focal length, respectively, as wide-angle photography, standard photography, and telephoto photography.

l) The main lens shall be capable of wide-angle photography by itself, and the first
It is assumed that the second sub-lens is capable of performing standard photography in cooperation with the main lens, and the second sub-lens is capable of performing telephoto photography in cooperation with the main lens and the first sub-lens.

ii) The main lens is one that can perform wide-angle I shadow by itself,
The first sub-lens is capable of standard photography in cooperation with the main lens, and the second sub-lens is capable of telephoto photography in cooperation with the main lens.

iii) The main lens is capable of telephoto photography by itself, the first sub-lens is capable of standard photography in cooperation with the main lens, and the second sub-lens is capable of cooperating with the main lens and the first sub-lens. The lens shall be able to work and take wide-angle shots.

iv) The main lens is capable of telephoto shooting by itself, the first sub-lens is capable of standard shooting in cooperation with the main lens, and the second sub-lens is capable of wide-angle shooting in cooperation with the main lens. It shall be possible to do so.

However, each of the above configurations has the following disadvantages.

In configuration i), a lens configuration that allows wide-angle photography is used as a standard, and two sub-lenses are sequentially added to this lens configuration to enable standard photography and telephoto photography, so telephoto photography is possible. The lens configuration has a focal length that is significantly changed from the reference lens configuration, and its Pesovoir sum becomes an extremely large negative value, resulting in a large curvature of field. In addition, in a lens configuration that allows telephoto shooting, three lenses are arranged side by side, so the overall length of the photographic lens becomes long.

In configuration ii), similar to configuration i), the lens configuration that allows telephoto shooting has a focal length that is significantly different from the standard lens configuration that allows wide-angle shooting, so The sum becomes a large negative value, and the field curvature is also large. In addition, since the large focal length change is made only by the second sub-lens, the magnification of the second sub-lens becomes large, and the lens configuration of the second sub-lens becomes complicated. Errors also tend to deteriorate imaging characteristics.

The difference in the configuration of Mt.) is that it is based on a lens configuration that can perform telephoto shooting, compared to the configuration of R. Since the configurations are the same, in a lens configuration that can perform wide-angle photography, the field curvature becomes large and the overall length of the photographing lens also becomes long.

In addition, since the second sub-lens cooperates with the first sub-lens and the main lens to enable wide-angle photography, the lens aperture becomes large, which increases the cost of the lens itself. At the same time, the accommodation space for retracting the second sub-lens from the photographing optical path becomes large, which may impede the ability to make the camera more compact.

In configuration iv), compared to configuration ii), the reference is simply changed from the wide-angle side to the telephoto side, and similarly, the lens configuration of the second sub-lens becomes complicated, and even a slight error may cause the image formation to deteriorate. The characteristics tend to deteriorate, and the field curvature is also large. In addition, as in the configuration iii), the aperture of the second sub-lens tends to be large, which increases the cost of the lens itself and may impede the ability to make the camera more compact.

On the other hand, in the case of the configuration according to the present invention described above, a lens configuration that allows standard photography is used as a reference, and by adding each sub-lens to this lens configuration, telephoto photography and wide-angle photography can be performed respectively. Therefore, the amount of change in focal length due to the first sub-lens or the second sub-lens is small compared to the reference lens configuration. Therefore, it is possible to easily maintain good imaging characteristics in both the lens configuration for telephoto photography and the lens configuration for wide-angle photography.

Additionally, since the amount of change in focal length due to the second sub-lens, which can take wide-angle shots in cooperation with the main lens, is small, its aperture does not become very large, so there is less increase in the cost of the lens itself. Also, it is possible to avoid an increase in the storage space for retreating from the photographing optical path.

〔Example〕

Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 9 is a top view of the camera according to the invention;
(1) is the release button, (2) is the mode selector switch, and (3) is the ↑ darkest lens.

This mode selector switch (2) is set to the <position E> position so that the focal length of the photographic lens (3) is the longest (hereinafter, this state is referred to as (tele mode)), and ( WIDE> position so that the focal length of the photographic lens (3) is the shortest (hereinafter referred to as
This state is called (wide mode)), and (S
TND) position, the photographic lens (3)
(Hereafter, we will refer to this state as (standard mode) so that the focal length of
), each of which is configured to switch the focal length of the photographing lens (3).

Further, by setting the mode selector switch (2) to the <OFF> position, the power supply to each part of the camera is stopped.

The photographic lens (3) includes a fixed barrel (6) connected to the camera body (5), a movable lens barrel (7) that moves in and out of the fixed barrel (6), and the like.

As shown in FIGS. 3, 5, and 7, the movable lens barrel (7) is connected to an automatic focus adjustment mechanism (not shown) to move in the optical axis (L) direction. A main lens (8) composed of three elements in three groups is supported, and focusing is performed at .

A cam barrel (9) that is rotatable around the optical axis (L) is fitted onto the movable lens barrel (7).
) is fitted with a fixed lens barrel (11) fixed to the camera body (5) via a plywood (10).

The cam cylinder (9) has a cam groove (9a) as shown in FIG.
) is formed, and a roller (13) rotatably attached to a guide pin [12] implanted on the outer peripheral surface of the movable lens barrel (7) is fitted into this cam groove (9a). There is.

Furthermore, this roller (13) passes through the cam groove (9a) and connects to the optical axis (L) formed on the inner peripheral surface of the fixed lens barrel (11).
Direction straight ahead? I(lla) is fitted. That is, by rotating the cam barrel (9) around the optical axis (L), the movable lens barrel (7)
is configured to move in the optical axis (L) direction.

In addition, as shown in Figures 1 to 8, a movable lens barrel (7
) has a switching tube (14) that is rotatable around the optical axis (L).
is fitted inside. As this switching tube (14) rotates, two sub-lenses (15) and (16), which will be described later, are connected to each other.
) to move in and out of the photographing optical path (P) and move the lens (
3) Focal length switching mechanism (FC) that switches the focal length.
).

An operating pin (17) is planted on the outer peripheral surface of the switching tube (14), and a roller (18) rotatably attached to the operating pin (17) is attached to the movable lens barrel (7). It passes through the formed circumferential groove (7a) and fits into a rectilinear groove (9b) formed in the cam cylinder (9) in the direction of the optical axis (L). That is, by the rotation of the cam barrel (9) around the optical axis (L), the switching barrel (14) moves in the optical axis (L) direction together with the movable lens barrel (7). It is configured to rotate around it.

Although not shown, the cam cylinder (9) is interlocked and connected to a motor that rotates in forward and reverse directions via a transmission mechanism. This motor is configured to rotate by operating the mode changeover switch (2) described above.

As shown in Figures 1 to 8, the movable lens barrel (7) has two lenses that cooperate with the main lens (8) to achieve focal lengths that are different from the focal length of the main lens (8). Secondary lens (1
5) and (16) are attached.

The first sub-lens (15) is composed of three elements in two groups, and is shown in Fig. 1 (
c), as shown in Fig. 7 and Fig. 8, the movable lens barrel (
The main lens (8) supported by the main lens (8) is inserted into the photographing optical path (P) behind the main lens (8) in a state farthest from the film surface (F), and cooperates with the main lens (8). This realizes a long focal length that is longer than the focal length of the main lens (8).

This first sub-lens (15) is rotatably supported by a holding frame (19) attached to the movable lens barrel (7) around an axis (x1) parallel to the optical axis (L), It is possible to move in and out of the photographing optical path (P). This holding frame (19) is held by a spring (20) on the side where the first sub-lens (15) protrudes into the photographing optical path (P) (see FIG. 4).
(in the counterclockwise direction in FIGS. 6 and 8).

The holding frame (19) also has an operating pin (19a) on the opposite side of the first sub-lens (15) with respect to its mounting axis (X,). Then, the cam part (14a) of the switching cylinder (14) that is rotated is connected to this operating pin (19).
By contacting and pressing a), the holding frame (19) resists the biasing force of the spring (20) and moves to the mounting axis (x,).
The first sub-lens (15) rotates around the photographic optical path (P
).

The second sub-lens (16) is composed of three lenses in three groups, and is supported by a movable lens barrel (7) as shown in Fig. 1(a), Fig. 3, and Fig. 4. The main lens (8) is on the film surface (
F) is inserted into the shooting optical path (P) behind the main lens (8), and works together with the main lens (8) to create a short focal length shorter than the focal length of the main lens (8). It is the realization of distance.

This second sub-lens (16) has a holding frame (2) that is rotatable around an axis (x2) parallel to a straight line orthogonal to the optical axis (L).
1), and can move in and out of the photographing optical path (P). This holding frame (21) is attached to the movable lens barrel (7) via the mounting plate (22), and the second sub-lens (16) is connected to the photographing optical path (1) by the spring (23). It is biased toward the protruding side (counterclockwise in FIGS. 3, 5, and 7).

Moreover, this holding frame (21) has an operating abutment part (21a) on the opposite side of the second sub-lens (16) with respect to its attachment axis (X2). Then, the cam part (14a) of the switching cylinder (14) that is rotated is connected to this operating contact part (
By contacting and pressing the holding frame (21a), the holding frame (21a)
) resists the urging force of the spring (23) and the mounting shaft center (×
2) The second sub-lens (16) is configured to be rotated around the lens, and the second sub-lens (16) is retracted from the first shadow optical path (P).

In addition, in FIG. 4, FIG. 6, and FIG. 8, the frame indicated by the two-dot chain line indicates the photographing optical path at the position of the first sub-lens (15) corresponding to the film frame on the film plane (F). (1)) represents the cross section.

Next, the operation of switching the focal length will be explained.

Figure 1 (A), Figure 3, and Figure 4 show the shadow lens (
3) shows the short focal length state (wide mode) where the focal length is the shortest.

At this time, the mode selector switch (2) is set to (WIDE>
is set in the position.

In this state, as shown in FIG. 3, the movable lens barrel (7) is at the position closest to the film plane (F) within its movement range. On the other hand, as shown in FIG. 4, the switching tube (14)
The cam portion (14a) is in contact only with the operation pin (19a) of the holding frame (19) of the first sub-lens (15),
The first sub-lens (15) is retracted from the photographing optical path (P),
The second sub-lens (16) projects into the photographing optical path (I]).

In this state, the mode selector switch (2) is set to <5TND>.
When set to the position, the motor rotates and the cam cylinder (
9) begins to rotate counterclockwise in FIG. Along with this rotation, the starting end (
roller (13) of the movable lens barrel (7) located at
However, the cam groove (9a) and the straight groove (ll) of the fixed lens barrel (11)
a) Guided by. This allows the movable lens barrel (
7) moves in a direction away from the film plane (F) (leftward in FIG. 3) along the optical axis (L).

In addition, as the cam barrel (9) rotates and the movable lens barrel (7) moves, the roller (18) attached to the switching barrel (14)
is guided by the circumferential groove (7a) of the movable lens barrel (7) and the linear groove (9b) of the cam barrel (9), and the switching barrel (14)
While moving in the direction away from the film surface (F) together with the movable lens barrel (7), the second
In the figure, it rotates counterclockwise.

As the switching tube (14) rotates, its cam portion (14a) moves to the second sub-lens (16) as shown in FIG.
) is formed on the holding frame (21) of the operating contact portion (21a
) and directs the second sub-lens (16) to the photographing optical path (P).
evacuate from. After that, the cam a (9a) of the cam cylinder (9)
) of the movable lens barrel (7) engages with the second
When reaching the bent portion (9y) of the cam groove (9a) shown in the figure, the rotation of the motor is stopped, and the movement of the movable lens barrel (7) and the rotation of the switching tube (14) are completed.

At this time, as shown in FIG.
) Operation pin (19a) formed on the holding frame (19)
The contact by the cam part (f4a) of the switching tube < 1-1) with respect to the first sub-lens (15
) remains retracted from the photographing optical path (P).

This state shown in Fig. 5 and Fig. 6 (sticker mode)
It is. That is, the first sub-lens (15) and the second sub-lens (16) are both in an intermediate focal length state, retracted from the photographing optical path (P).

In this way, when retracting the first sub-lens (15) and the second sub-lens (16) from the photographing optical path (P), the first sub-lens (15) is moved parallel to the optical axis (L). Axial core (
×, ), and the second sub-lens (16) is swung around an axis (X2) parallel to a straight line perpendicular to the optical axis (L), thereby achieving a relatively large diameter. The space for housing the second sub-lens (16), which tends to be small, is made small in the radial direction of the photographic lens (3), thereby making the camera more compact.

In addition, both the first sub-lens (15) and the second sub-lens (16) are located on one side with respect to the plane containing the optical axis (L) when retracted from the photographing optical path (P). It is configured so that That is, when the movable 'vllllPl (7) moves along the optical axis (L) direction with the change of A←point distance, = 1, the first lens attached to the movable lens barrel (7) Sub-lens (15) and second sub-lens (16)
) also moves together with the movable lens barrel (7), so it is not possible to provide any other equipment of the camera in the housing space for both lenses (15) and (16).

However, by providing the accommodation space for both lenses (15) and (16) on one side as described above, it is possible to provide a mouse, a camera, and other devices in the space on the opposite side. And like this, both lenses (15).

In providing the storage space for (16) on one side, the lens can be made even more compact by using the above-mentioned structure in which both lenses (15) and (16) move in and out.

Furthermore, at this time, the second sub-lens (16) is formed by moving the movable lens barrel (7) during the transition from the (wide mode) in Fig. 3 to the (standard mode) in Fig. 5. It is accommodated in a state where it partially enters the space (vl) that is provided.

That is, the housing part of this second sub-lens (16) is made as small as possible to make the camera more compact, and the space inside the camera behind the darkest lens (3) can be used effectively. It is.

Now, in the (standard mode) shown in Fig. 1 (b), Fig. 5, and Fig. 6, when the mode selector switch (2) is set to the <position E), the motor will start rotating again. ,
The cam cylinder (9) further begins to rotate counterclockwise in FIG.

Along with this, the movable lens barrel (7) moves further away from the film surface (F) along the optical axis (L) in the same manner as before. In addition, the switching tube (14) also has a movable lens barrel (
7) and further rotates counterclockwise in FIG. 2 while moving along the optical axis (L).

As the switching tube (14) rotates, as shown in FIG.
) is released from contact with the operating pin (19a), and the first sub-lens (15) is placed in the photographing optical path (P
) is projected within. After that, the roller of the movable lens barrel (7) (
13) reaches the end (9z) of the cam groove (9a) shown in FIG. 2, the rotation of the motor is stopped and the movable lens barrel (7)
The movement of the switching tube (14) and the rotation of the switching tube (14) are completed.

At this time, as shown in FIG.
) has not been released from contact by the cam part (14a) of the switching tube (14) with the operating contact part (21a) of the holding frame (21), and the second sub-lens (16) is in the photographing optical path ( P)
remains evacuated.

This state shown in FIG. 1(c), FIG. 7, and FIG. 8 is (tele mode). That is, the first sub-lens (15)
is a long focal length state in which the focal length located in the photographing optical path (P) is the longest.

In this state, the second sub-lens (16) is formed by moving the movable lens barrel (7) during the transition from (wide mode) in Figure 3 to (tele mode) in Figure 7. It is housed in a state where it almost fits into the space (v).

Furthermore, although detailed explanation is omitted, from this state, the mode selector switch (2) is set to the (STND) position and
By sequentially setting the <WIDE> position, the movable lens barrel (7) moves in the direction approaching the film surface (F) and the first sub-lens (15 ) and the second sub-lens (16) (P)
The configuration is such that (standard mode) and (wide mode) appear sequentially.

The first sub-lens (15) and the second sub-lens (16)
) can be changed as appropriate. Next, some examples will be explained. It should be noted that the same components as those in the previous embodiment will be designated by the same numbers in the drawings unless necessary, and a description thereof will be omitted.

b) As shown in FIGS. 10 and 11, the first sub-lens (15) and the second sub-lens (16) are respectively aligned with an axis (xl) parallel to the optical axis (L), (x3) so that they move in and out of the photographing optical path (P) by rotating around the lens, and the retracted positions of these two sub-lenses (15) and (16) are in the plane that includes the optical axis (L). so that it is on the opposite side.

A holding frame (2) that holds the second sub-lens (16) is provided.
4), the second sub-lens (1
An operating pin (24a) is provided on the opposite side from 6).
By bringing the cam portion (14a) of the rotating switching tube (14) into contact with this operating pin (24a) and pressing it, the second sub-lens ( 16
) is retracted from the photographing optical path (P).

In addition, in FIG. 11, the cross section of the photographing optical path (P) at the position of the first sub-lens (15) is shown by a chain double-dashed line, as in the previous embodiment.

The focal length in this embodiment is changed by rotating the switching barrel (14) as in the previous embodiment, and from the (standard mode) shown in FIG. 11, the switching barrel (14) is rotated clockwise. When the switch tube (14) is rotated in the counterclockwise direction, the mode is set (wide mode), and when the switching tube (14) is rotated counterclockwise, the switch is set (tele mode).

(Example) As shown in FIGS. 12 and 13, the first sub-lens (15) and the second sub-lens (16) are arranged with an axis (xl) parallel to the optical axis (L), (x4) so that they move in and out of the photographing optical path (P) by rotating around the lens, and the retracted positions of these two sub-lenses (15) and (16) are in a plane that includes the optical axis (L). so that they are on the same side.

The mounting structure of the second sub-lens (16) is almost the same as the structure of A) described above, and is attached to the operating pin (26a) formed on the holding frame (26) of the second sub-lens (16). Switching tube (
When the cam part (14a) of 14) contacts and presses,
The second sub-lens (
16) from the photographing optical path (P).

In addition, in FIG. 13, the photographing optical path (P) at the position of the first sub-lens (15) in (standard mode) is indicated by a dashed line, and the photographing optical path (P) at the position of the second sub-lens (16) in (tele mode) is indicated by a dashed line. The imaging optical path (P) at the position is indicated by a chain double-dashed line.

Similarly, the focal length can be changed by rotating the switching barrel (14) clockwise from (standard mode) shown in FIG. 13 to change to wide mode (wide mode). It is done so that it becomes (tele mode) by being moved.

In this configuration, since the second sub-lens (16) has a relatively large diameter, the second sub-lens (16) prevents the photographing optical path (P) from being vignetted, while making the camera more compact. In order to achieve this, a portion of the movable lens barrel (7) and the switching tube (14) shown by imaginary lines in FIG. 12 are cut away.

Note that the focal length change may be performed mechanically in conjunction with a manually operated control lever, instead of using the motor described in the previous embodiment.

〔Effect of the invention〕

As described above, the camera according to the present invention is capable of photographing at a long focal length longer than the focal length of the main lens by using the main lens and the first sub-lens, and by using the main lens and the second sub-lens. By selectively switching between shooting at a short focal length shorter than the focal length of the lens and shooting at an intermediate focal length J between the long focal length and short focal length using only the main lens, you can achieve three different This makes it easy to take pictures at different focal lengths with just one camera, making it easier to take pictures with many different perspectives, compositions, and depths of field. .

Moreover, by making it possible to achieve an intermediate focal length with the main lens body and reducing the amount of change in focal length caused by the two sub-lenses, deterioration in imaging characteristics can be reduced at any focal length.

Furthermore, since the aperture of the sub-lens for realizing a short focal length can be made small, an increase in cost is less likely to occur, and it is possible to avoid an increase in the space for accommodating the sub-lens.

Therefore, as a whole, it has been possible to provide a camera that can diversify uniform shadows while always maintaining good imaging performance, which is advantageous in terms of both cost and space.

[Brief explanation of the drawing]

The drawings show an embodiment of the camera according to the invention, and are shown in FIG.
A) or C) are partially cutaway views of the photographic lens.
Figure 1 (A) shows the wide mode, Figure 1 (II) shows the standard mode, Figure 1 (C) shows the tele mode, Figure 2 is an exploded perspective view of the photographic lens, and Figure 3 shows the wide mode. FIG. 4 is a vertical cross-sectional view of the photographic lens in wide mode, FIG. 5 is a vertical cross-sectional view of the photographic lens in standard mode, and FIG. 6 is a cross-sectional view of the photographic lens in standard mode. 7
The figure is a longitudinal cross-sectional view of the taking lens in tele mode, Fig. 8 is a cross-sectional view of the taking lens in tele mode, Fig. 9 is a plan view of the camera, and Fig. 10 is a standard equivalent to Fig. 5 showing another embodiment. FIG. 11 is a cross-sectional view of the standard mode photographing lens corresponding to FIG. 6 in another embodiment shown in FIG. 10, and FIG. 12 shows yet another embodiment. FIG. 13 is a vertical sectional view of the standard mode photographing lens corresponding to FIG. 5, and FIG.
FIG. 2 is a cross-sectional view of the standard mode photographing lens corresponding to the figure. (8)...Main lens, (15)...First sub-lens, (Step 6)...Second sub-lens,
(P)...Photographing optical path, (FC)...Focal length switching mechanism.

Claims (2)

[Claims] (1) a main lens; a first sub-lens that cooperates with the main lens to realize a long focal length longer than the focal length of the main lens; and a first sub-lens that cooperates with the main lens to realize a focal length of the main lens; a second sub-lens realizing a short focal length shorter than the distance; an intermediate focal length state in which both the first sub-lens and the second sub-lens are retracted from the photographing optical path; A focal length switching mechanism is provided for selectively switching between a long focal length state in which the sub-lens is located in the optical path and a short focal length state in which the second sub-lens is located in the photographing optical path. camera. (2) The ratio of the long focal length to the focal length of the main lens and the ratio of the focal length of the main lens to the short focal length are approximately equal.
The camera described in item 1).