JPH05188453A - Film unit with lens - Google Patents

Abstract

PURPOSE:To obtain a photograph having excellent image quality with the lower probability of an under-exposure by specifying the EV value of the film unit with lenses which has a fixed focus, fixed aperture and fixed shutter speed and is previously loaded with an unexposed film in a photographable state to a specific range and the finder coverage thereof to a specific value or above. CONSTITUTION:The EV value and finder coverage of the film unit with lenses are specified. Namely, the EV value is the value to indicate the capacity to allow the passage of a light quantity by the combination of aperture values and shutter speeds. The EV value in this case is >=11 and <=13.5, more preferably >=12 and <=13.3, more particularly preferably >=13 and <=13.3. The aperture value and shutter speed for determining the EV value within this range are such that the fixed aperture value is >=5.6, more preferably >=8.5 and <=11 and more particularly preferably >=9.0 and <=10.5. The shutter speed is preferably 1/50 to 1/250sec, more particularly preferably 1/80 to 1/125/sec. The finer coverage is >=87%, more preferably 87 to 120% and more particularly preferably 90 to 110%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit with a lens in which a film (silver halide color light-sensitive material) is preliminarily loaded in a photographable state and can be photographed immediately.

[0002]

2. Description of the Related Art In recent years, a lens-fitted film unit (hereinafter also referred to as the present camera), which is sold in a state in which a simple plastic camera is loaded with a silver halide color photosensitive material, has become widespread. This frees the user from the trouble of loading a film into an ordinary camera and the failure caused by a mistake in loading the film, and increases the opportunity for taking photographs due to its simplicity. In addition, a strobe type, a telephoto type, and a super wide-angle type have been developed and put into practical use according to the purpose of shooting.

As is well known, the lens-fitted film unit is a simple type camera in which a photosensitive material is preliminarily loaded by a maker, and the user only uses it to photograph one loaded photosensitive material. Since the film unit is sent to the developing station in a state where the photosensitive material is stored, the camera has a very simple structure to reduce the cost.

Therefore, these lens-equipped film units are aimed at low cost, and unlike ordinary cameras, the drive system, optical system, and electrical system are greatly simplified, resulting in unsatisfactory development finish and print quality. There are many points and improvements are desired.

Also for the finder section, a so-called frame-type finder is used because of its low price. The finder of this film unit with a lens is mainly intended to confirm the center position of the subject, and the finder field of view is about 60 to 70% in most cases.

Therefore, if the cameraman holds the film unit with a lens while looking through the viewfinder so that all the subjects to be photographed are included in the viewfinder, the photographer actually shoots the subject farther than necessary, and the photographer takes a picture. It is also true that the result of printing with the image is that the subject is smaller than expected, and that the image quality deteriorates due to the smaller subject. Further, in a film-integrated camera with a built-in flash, the flash is unnecessarily distant from the shooting, and the light amount often becomes insufficient.

A film unit with a lens is generally designed to have a large aperture value so that a simple lens can be brought into focus. However, since the sensitivity is insufficient, the film unit I
An SO sensitivity of 320 or more is generally used. However, depending on the shooting scene, there are still many underexposed photographs, which makes users dissatisfied.

Although there is a proposal to load an ultra-high-sensitivity film, the image quality is not yet sufficient for general use.
There is also a drawback in that the image quality remains unsatisfactory if the aperture value is simply reduced, and since the simple viewfinder has a low field of view, an unnecessary high-brightness portion around the subject is captured, resulting in overexposure. ..

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lens-equipped film unit which is less likely to be underexposed even with a simple camera and which produces a photograph of excellent image quality.

[0010]

The object of the present invention is to provide a fixed focus, a fixed aperture,
In a film unit with a lens, which has a fixed shutter speed and a finder and is preliminarily loaded with an unexposed film in a photographable state, the EV value of the lens unit with a lens is 11 or more and 13.5 or less, and the viewfinder field ratio is 87%. This is achieved by the film unit with a lens characterized by the above.

In the present invention, the EV value is 11 or more and 13.5 or less, preferably 12 or more and 13.3 or less, and particularly preferably 13
It is above 13.3.

In the present invention, the EV value (exposure value) is the same as a general definition, and is a value indicating the ability to pass a light amount depending on the combination of the aperture value (F) and the shutter speed (Tsec). It is expressed by the formula.

2 ^EV = F ² / T The proper EV value is the brightness of the subject and the film (photosensitive material).
Determined by the sensitivity of. Therefore, in the present invention,
Since this is a photographing unit in which an unexposed film having a specific sensitivity has been loaded in a photographable state, the EV value can be set so that a photograph satisfying the user can be obtained.

The aperture value and shutter speed for determining the EV value within the range of the present invention are as follows.

In the present invention, the fixed aperture value is 5.6 or more, preferably 8.5 or more and 11 or less, and particularly preferably 9.0 or more and 10.5 or less. Shutter speed is preferably 1 /
50 to 1/250 sec, particularly preferably 1/80 to 1/125 sec. The fixed aperture value F and the shutter speed may be appropriately combined so as to obtain the EV value of the present invention.

In the present invention, the sensitivity of the unexposed film preliminarily loaded in a photographable state is ISO sensitivity, preferably 200 or more and 1000 or less, and particularly preferably 320 or more and 800 or less.

The finder field ratio is the percentage of the subject area in the finder with respect to the effective image area formed on the photosensitive material. The field of view of the viewfinder varies depending on the shooting distance for a fixed viewfinder, but for the film unit with a lens of the present invention, a subject (subject distance 2) at a distance of 1 m to 3 m at which shooting is most frequently performed.
The field of view for m) is defined as the field of view of the finder. The field of view varies depending on the position of the viewpoint, but it is assumed that the viewpoint is located on the optical axis of the viewfinder.

A normal film unit with a lens is designed so that an image is formed on a photosensitive material in a wider area than a subject area confirmed by a photographer in a viewfinder. Therefore, the field of view of the photographing unit is 85%. Often less than.

The visual field of the lens-fitted film unit of the present invention is 87% or more, preferably 87 to 120%, and particularly preferably 90 to 110%. When the field of view exceeds 100%, it is preferable to provide a mark indicating the photographing area (effective image area) in the finder. If the field of view exceeds 120%, the photographing area in the viewfinder becomes too small and the subject becomes difficult to see, which is not preferable.

In order to achieve the visual field ratio of the present invention, it is preferable to install at least one concave lens in the finder portion, and it is preferable to use two or more concave Galileo lenses. It is visually preferable that the finder magnification is 0.4 to 0.7 times, particularly 0.4 to 0.5 times.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the appearance of a lens-fitted film unit according to the present invention. This camera is provided with a 35 mm film (J135) pre-loaded, and does not rewind after shooting. The film is sent to the manufacturer while it is still in the camera, the film is taken out from the camera, and the film is developed and printed.

The unexposed film used in this camera is I
The SO sensitivity is 320 or more and 800 or less (in this embodiment, ISO sensitivity 40
It is loaded with the film of 0) wound on the spool,
It is designed to be rolled up in the Patrone each time it is taken. Therefore, on the maker side, the film already taken can be taken out from the camera in the bright room.

Further, the taken film can be easily taken out by bending a part of the back cover. Therefore, if the camera part is checked and an unexposed film is newly loaded and the back cover is replaced. It can be reused.

As the cartridge and spool to be loaded into this camera, a cartridge having a smaller outer diameter of 20.6 mm and a spool having a spool diameter of 9 mm are used, which are smaller than the commonly used cartridge (JIS K7528) and spool. ..

As a result, the total thickness of the camera can be suppressed to around 24 mm, and an ultra-thin compact camera is realized.

The camera is provided with a carton (paper cover) made of cardboard on which a product name, a simple usage method, etc. are displayed on a part of its outer surface.

FIG. 2 is a development view showing the structure of this camera.

Reference numerals 10, 20 and 30 denote a camera main body, a front cover and a back lid, which are main components of the camera, 40 is a built-in strobe unit, and 50 is a film winding unit.

When the camera body 10 is used alone, each member constituting the film winding unit 50 is mounted, and the shutter case 11 for accommodating the shutter blades is further mounted.

The shutter case 11 is fixed by engaging claws 11A projecting on both sides with a locking portion 10A on the front surface of the camera body 10, and the shutter blades are linked to the film winding unit 50.

Further, on the front surface of the shutter case 11, a photographing lens 12 which is a fixed lens having a focal length f = 30 mm and a diaphragm F of 9.0 to 10.5 (F9.5 in this embodiment) is dropped. Rarely 13A that engages with the guide pin 11B
It is covered by a lens presser 13 equipped with.

The camera body 10 and the shutter case 11 described above
Is made of a black matte plastic material having some elasticity, including the front cover 20 and the back cover 30 described above.

On the other hand, the strobe unit 40 is mounted and supported with reference to holes 40A and 40B on the substrate which engage with the guide pins 10B and 10C on the front surface of the camera body 10, respectively.

The upper and lower battery contact pieces 41, which are integrated with the strobe unit 40, are inserted into the upper and lower slit holes 10D of the camera body 10 and projected into the battery chamber on the back of the camera body 10 to form an AA battery as a strobe charging power source. The power supply battery E which is

The integrated main capacitor C is stored in a capacitor chamber formed under the shutter case 11.

The lens retainer 13 and the strobe unit 40 described above.
The fixing and integration of the above with the camera body 10 is completed by mounting the front cover 20 on the camera body 10.

Prior to mounting the front cover 20 on the camera body 10, an objective lens 21 made of a concave lens of a finder is dropped in front of the front cover 20 and is fixed by engaging a decorative cover 22. The makeup cover 22 has guide pins 22 on the back.
A and four claws 22B are protrudingly provided, and the front cover 20
It is attached by engaging the holes 20A on the front surface and the locking portions 20B at four places.

The front cover 20 is further mounted on the front surface of the camera body 10 after the eyepiece 23 made of a convex lens of the finder is engaged and photographed on the back surface.

The finder objective lens 21 and the eyepiece lens 23 constitute an inverse Galileo finder, and the taking lens 12
The optical axis of and the optical axis of the finder intersect at 2 m in front of the camera, and the field of view is set to be between 90% and 110%. Of course, the optical axes may be set to be parallel.

The front cover 20 is provided with a hole 20C, a claw 20D and three engaging portions 20E on the back surface, and each of them is used as a guide pin 10E, a nail 10F and a side engaging portion 10G on the front surface of the camera body 10. It is fitted and attached.

The lens retainer 13 and the strobe unit 40 are fixed to the camera body 10 by the engagement device of the front cover 20 to the camera body 10.

The camera body 10 mounted with the front cover 20
In the cartridge, a cartridge chamber and a scroll chamber (neither shown) formed on the back surface of the cartridge are loaded with a cartridge P1 and a spool S2 around which an unexposed film F is wound.

The film F has a cartridge P at its tip.
It is locked in the spool in 1 and is loaded in the cartridge P1 in a condition that it can be wound.

A back cover 30 is attached to the back surface of the camera body 10 in which the film F is loaded so that the film F is protected from light and the focus surface position is restricted.

The back cover 30 is provided with claws 30A and 30B on the front surface thereof and locking holes 30C and 30D on the side surfaces thereof.
Claws 30A and 30B are engaged with the camera body 10 when mounted on the camera.
On the 10H and 10J, the one holes 30C and 30D are the nails 10 of the camera body 10.
It is fixed by engaging K and 10L.

Next, details of the film winding mechanism 50, the sector charge mechanism 60, and the film counter mechanism 70 will be described.

FIG. 3 shows each of the above-mentioned mechanisms at an angle as viewed from the rear side of the camera, and FIG. 4 shows a film and a cartridge loaded in the camera.

In FIG. 3, reference numeral 10 denotes a unit including a film winding mechanism and the like, which is a camera body. In the camera body 10, a cartridge chamber 15A and a scroll chamber 15B are provided as two storage chambers for film winding and film loading in the same plane on both sides of the screen frame 16 which is the exposure unit.
Is provided so that the J135 film FL wound in the cartridge P1 which is the storage container shown in FIG. 4 can be loaded.

The film FL used in the present camera of this embodiment is a roll film J135, which is similar to a general camera, and is used in advance in a dark room or the like by using a cartridge as a container.
The end of the spool S1 is fixed to the spool S1 and the film is wound up for a predetermined number of frames so that the film can be photographed. The film in this state will be loaded into the camera. The loading method will be described below.

The cartridge P1 is loaded in the cartridge chamber 15A so that the spool S1 of the cartridge P1 is engaged with the fork 52 of the hoisting fork 52. On the other hand, the spool S2 is also inserted in the scroll chamber 15B. Then, in this embodiment, the film FL is pulled out until the tip of the film notcher FN of the film FL matches the index 17A on the lower portion of the lower rail surface, and the tip of the film FL is slit SL of the spool S2.
And the perforation P of the film FL is locked to the nail H.

Next, the back cover 30 is covered and the cover is light-tight.
Then, the main camera in this state is attached to the film winding device, and the film FL is attached to the spool S2 of the scroll chamber 15B.
The film is loaded by winding it up. That is, by loading the film FL in this way, the film FL is sequentially wound into the patrone P1 for each photographing, and after the photographing of a predetermined number of frames is completed, in the present embodiment, two frames are preliminarily fed. Then, the front end of the film FL is wound into the cartridge P1 with the required length left without being wound into the cartridge. Therefore, this cartridge can be taken out from this camera in a bright room.

Next, the mechanism of the main body will be described.

The camera body 10 includes a film winding mechanism 50 including a photographing lens 12, a sector charge mechanism 60,
The main mechanism of the film counter mechanism 70 is incorporated therein.

First, the film winding mechanism and the sector charge mechanism will be described.

Reference numeral 51 is a film winding knob, and the film FL loaded as described above is wound up by rotating the film winding knob 51 counterclockwise. A cam 55 having a fan-shaped cam portion 55B at the lower portion, which is coaxial with the sprocket gear 54 having eight teeth and which meshes with the perforation P of the film FL, has a fan-shaped cam portion 55B at a lower portion thereof, and is rotated counterclockwise by exactly
It is designed to rotate.

That is, the film is rolled up with the length of eight perforations, which is the number of teeth of the sprocket gear, as one frame, and the frame size is a so-called full size frame size of 24 × 36 mm.

By the counterclockwise rotation of the cam 55, the fan-shaped cam portion 55B naturally rotates counterclockwise as described above, and in the process, the fan-shaped cam portion 55B moves the charge lever 61 and the charge lever shaft 63. Is rotated clockwise against the spring force of the charge lever spring 64 that urges the charge lever 61 in a counterclockwise direction, and the triangular ketobashi 61C provided on the charge lever 61 causes the rising portion 65B of the sector lever 65 to rise.
Is pressed, and then the rising portion 65B is overcome and the sector charge mechanism is charged as shown in the figure.

Pin 65C of the sector lever 65 and the camera body 10
A sector spring 67 is stretched between the pins 18C provided at the sector lever 67, and the tensile force of the sector spring 67 causes the sector lever 65 to move.
The left end of the elongated hole is brought into contact with a pin 18B provided on the camera body 10 that guides the elongated hole of the camera in a slidable and rotatable manner, and the sector lever
Pin 18 provided on camera body 10 with arm plate 65D provided on 65
It comes in contact with E. Further, a sector drive pin 65A for actuating the sector 66 pivotally supported by the sector pin 18D provided on the camera body 10 is inserted in the forked portion of the sector 66.

As will be described later, the cam stopper after shooting is completed.
The projecting portion 62D of 62 is removed from the groove portion 55A of the cam 55,
The arm portion 57A of the hoisting stopper 57 changes from the state shown in the drawing to change the arm portion 61A of the charge lever 61 and the arm portion of the cam stopper 62.
The arm 62A is in contact with the end surface of the arm portion 61A by the spring force of the hoisting stopper spring 58 which is displaced from each edge of the arm 62A and urges clockwise. When the cam 55 rotates exactly once as described above by the film winding and the groove 55A of the cam 55 returns to the initial position, the spring force that biases the cam stopper 62 in the clockwise direction by the horizontal end portion of the charge lever spring 64. As a result, the protrusion 62D of the cam stopper 62 jumps into the groove 55A. By this jumping operation, the lock of the arm portion 57A of the hoisting stopper 57, which was locked at the end surface of the arm portion 62A of the cam stopper 62 at this time, is released.

The outer cylindrical surface of the film winding knob 51 is a ratchet gear, and the V-shaped projection at the tip of the winding stopper 57 is released by the spring force of the winding stopper spring 58 due to the release of the locking. It will jump into the tooth groove of the ratchet gear 51A and prevent the film winding knob 51 from rotating in the counterclockwise direction. That is, when the film winding is completed, the film winding knob 51 is prevented from further winding rotation.

Further, in the camera body 10, the tip of the reverse rotation preventing claw 53 utilizing the elasticity of the resin material is pressed against the ratchet gear 51A so as to prevent the film winding knob 51 from rotating in the opposite winding direction. It has become.

By pressing the release button 25 of the front cover 20, a release button pin 25A is planted on the back surface of the release button 25.
Operates in the direction of arrow A. That is, the front cover 20
When attached to the camera body 10, the winding knob
51 By the operation of the tip of the release button pin 25A in the direction of arrow A described above, the hoisting stopper 57 rotates counterclockwise against the spring force of the hoisting stopper spring 58. Then, from the end surface of the arm portion 57A of the hoisting stopper 57, the arm portion of the charge lever 61
The edge of 61A is disengaged, and the charge lever 61, and thus the cam stopper 62, is rotated counterclockwise by the spring force of the charge lever spring 64.

The charge lever 61 is rotated counterclockwise by the spring force of the charge lever spring 64, which is stronger than the sector spring 67.
C hits the rising portion 65B of the sector lever 65 and then comes off the rising portion 65B. Therefore, the sector lever 65 rotates clockwise around the pin 18B in the long groove of the sector lever against the tensile force of the sector spring 67, and the sector spring 67
It returns to its original state due to the pulling force of. Therefore, sector drive pin 65A
Will rotate sector 66 about sector pin 18D to expose the film and then close it.

The shutter speed T performed by opening / closing the sector 66 is 1/80 to 1/125 sec (1/10 in this embodiment).
0 sec) is set.

On the other hand, the cam stopper 62 also rotates counterclockwise together with the charge lever 61 as described above,
The protruding portion 62D of 62 is removed from the groove portion 55A of the cam 55. Therefore, even if you stop pressing the release button, the winding stopper
The arm portion 57A of 57 is biased in the clockwise direction by the spring force of the hoisting stopper spring 58, but the arm portion 61A of the charge lever 61.
Is stopped by the end face of the
The shaped protrusion does not lock the ratchet gear 51A of the winding knob 51. Therefore, the next film winding can be performed.

Next, the film counter mechanism will be described.

As described above, 72 meshes with the V groove 56A provided at the upper end of the cam shaft 56 that is planted in the cam 55 that rotates integrally with the sprocket gear 54, and one frame of film is wound up to form a cam shaft. It is an exponential gear that rotates clockwise one tooth each time 56 rotates once.

An index plate 71 is attached to the upper surface of the index plate gear 72 so that the remaining number of film-capable images can be displayed through the film counter window 26 on the upper surface of the front cover 20.

A projection 72A is provided on the lower surface of the exponential gear 72, and the projection 72A is formed on the lower surface of the charge lever 61 by the next film winding after a predetermined number of frames have been photographed.
It is designed to be inserted between the E and another protruding portion 62E of the cam stopper 62 so as to enter. Then, the projecting portion 72A is replaced by the two projecting portions 61.
By entering between E and 62E, the film is wound up by one frame, and even if the cam 55 makes one rotation and the charging of the sector is completed, both the projecting portions 61E and 62E become the projecting portion 72A of the exponential gear 72. As the movement is blocked, the charge lever 61 cannot operate and the protruding portion 62D of the cam stopper 62 is also in the groove portion of the cam 55.
You will not be able to jump into 55A. The arm portion 57A of the hoisting stopper 57 contacts the end face of the arm portion 62A of the cam stopper 62 by the spring force of the hoisting stopper spring 58, and the V-shaped projection at the tip of the hoisting stopper 57 locks the ratchet gear 51A. Also, it is not possible to operate the charge lever 61 to open and close the sector to expose the film.

As described above, in the present embodiment, when two frames of film are fed in an idle manner, the index plate gear 72 rotates by two teeth, and this rotation causes the protrusion 72 of the index plate gear 72 to rotate.
A is a charge lever that holds down the protrusion 61E at all.
The movement of 61 is blocked, but another protrusion 62 of the cam stopper 62 is
It is designed to come off from E. Therefore, the protrusion 62D
Jumps into the groove 55A of the cam 55, the winding stopper 57 is disengaged, and the winding stopper 57 locks the winding knob 51, so that the film cannot be wound. Further, as described above, the movement of the charge lever 61 is blocked so that the film cannot be exposed. In this way, the tongue at the leading end of the film is prevented from being caught in the cartridge and the tongue of the required length is secured. Therefore, in order to make the camera compact, even if a cartridge having a small outer diameter is used, there is no problem in pulling out the film from the cartridge at the time of development.

The construction and operation of the lens-fitted film unit of this embodiment have been described above. However, the present invention is not limited to the method of winding the color photosensitive material on the cartridge. For example, there may be a system in which a camera portion (b) and a cartridge portion (a) as shown in FIG. 5, the cartridge portion is detachable from the camera portion, and the cartridge portion also serves as the camera portion back cover. In the figure, 521 is a cartridge portion containing a film, 522 is a main body portion of a photographing unit, 523 is a photographing lens,
Reference numeral 524 is a shutter and a fixed diaphragm, and 525 is a locking portion that locks the cartridge portion 521 with the main body portion 522 of the photographing unit to enable photographing. The film unit with a lens having such a configuration has great advantages in reuse of the camera portion and reuse of the cartridge portion.

In the present invention, as described in the embodiments, it is preferable that the main body of the photographing unit and a part of the parts are made of plastic for weight saving and cost reduction. The preferred plastic conditions are excellent light-shielding properties, little influence on the photographic characteristics of the light-sensitive material,
Known materials can be used as long as they are easy to recycle and use. As a preferred specific example, polystyrene with carbon black or pigment added to provide light-shielding properties,
Polypropylene, polyethylene, polyvinyl chloride, polymethylmethacrylate, polyethylene terephthalate,
Examples thereof include cellulose acetate and copolymers thereof.

The power source of the strobe may be an ordinary alkaline battery or the like as in the embodiment, but a lithium battery may be used, and the environmental pollution due to the disposal of the used battery may be prevented or the used battery may not be used. It is more preferable to use a mercury-free battery or a rechargeable battery to reduce problems in reprocessing.

The lens-fitted film unit of the present invention is preferably provided with a carton (cover) as shown in the examples.

The material of the cover is preferably one that can absorb impact, for example, paper, sponge, rubber, leather, cloth or the like. The shape of the cover does not matter, but it is preferable to use a belt-shaped or box-shaped cover, and make holes so as not to interfere with the functions and operations of the lens unit, viewfinder unit, strobe unit, shutter button unit, film winding unit, etc. of the shooting unit. A covered cover is preferred.

The lens-fitted film unit of the present invention is preferably hermetically packaged in a plastic case, a moisture-proof bag or the like after the production and before use. Relative humidity at 25 ℃ is 30 ~ 70%, preferably 40 ~
It is 60%, particularly preferably 45 to 55%, and the oxygen partial pressure can be made lower than atmospheric pressure by filling with an inert gas.

[0077]

According to the present invention, since the field of view is higher than that of the conventional lens-equipped film unit, it is possible to prevent the photographer from taking an image farther than necessary, and the visual image quality is not deteriorated. The film unit with a lens is provided, which allows you to obtain high-quality photographs with less chance of being underexposed.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of a film unit with a lens of the present invention.

FIG. 2 is an exploded perspective view of the overall configuration of the embodiment shown in FIG.

FIG. 3 is an exploded perspective view of a mechanism portion of the embodiment shown in FIG.

FIG. 4 is a perspective view showing a film and a cartridge used in this embodiment.

FIG. 5 shows a cross-sectional view of another embodiment.

[Explanation of symbols]

 10 Camera body 12 Shooting lens 21 Objective lens (finder) 23 Eyepiece (finder) 66 Sector (shutter blade) FL film P1 Patrone

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ken Ishida 1st Sakura-cho, Hino City, Tokyo Konica Stock Company In-house

Claims (1)

[Claims] 1. A lens-equipped film unit having a fixed focus, a fixed aperture, a fixed shutter speed, and a viewfinder, which is preliminarily loaded with an unexposed film in a photographable state, and the EV value of the lens-equipped film unit is 11 or more.
A film unit with a lens that is 3.5 or less and has a viewfinder field ratio of 87% or more.