Lens-fitted photo film unit
A lens-fitted photo film unit is not provided with a flash device. A photo film having ISO sensitivity of 1600 or above is preloaded in the lens-fitted photo film unit in a factory. An exposure device has a large-exposure amount mode and a small-exposure amount mode. In the large-exposure amount mode, appropriate exposure can be given to a subject when an exposure value at ISO 100 is less than 8. A mode switching operation member selects the large-exposure amount mode or the small-exposure amount mode.
1 . A lens-fitted photo film unit without a flash device comprising:
a photo film, preloaded in a factory, having ISO sensitivity of 1600 or above; and
an exposure control device having a large-exposure amount mode and a small-exposure amount mode, and being capable of giving appropriate exposure to a subject when an exposure value at ISO sensitivity of 100 is less than 8 in said large-exposure amount mode.
2 . A lens-fitted photo film unit as claimed in claim 1 , further comprising a mode switching member for selecting one of said large-exposure amount mode and said small-exposure amount mode.
3 . A lens-fitted photo film unit as claimed in claim 2 , wherein film sensitivity of said photo film is no less than ISO 3200.
4 . A lens-fitted photo film unit as claimed in claim 3 , wherein the following condition is satisfied:
f 2.8 ≦f 0 <f 8
where f-number in said large-exposure amount mode is f 0 .
5 . A lens-fitted photo film unit as claimed in claim 4 , wherein the following condition is satisfied:
L≦28 mm
where focal length of a taking lens is L.
6 . A lens-fitted photo film unit as claimed in claim 5 , wherein the following condition is satisfied:
17 mm≦ L≦ 28 mm
7 . A lens-fitted photo film unit without a flash device comprising:
a photo film, preloaded in a factory, having ISO sensitivity of 1600 or above;
a stop device having a small aperture state and a large aperture state; and
a mode switching operation member for selecting one of a first photographic mode which establishes said small aperture state and a second photographic mode which establishes said large aperture state, appropriate exposure value at ISO sensitivity of 100 being less than 8 in said second photographic mode.
8 . A lens-fitted photo film unit as claimed in claim 7 , wherein film sensitivity of said photo film is no less than ISO 3200.
9 . A lens-fitted photo film unit as claimed in claim 8 , wherein the following conditions are satisfied:
f 13 ≦f 1 , and f 2.8 ≦f 2 ≦f 8
where f-number in said small aperture state is f 1 , and f-number in said large aperture state is f 2 .
10 . A lens-fitted photo film unit as claimed in claim 9 , further comprising: a shutter device for setting shutter speed to a high-speed shutter state in said first photographic mode, and setting the shutter speed to a low-speed shutter state in said second photographic mode.
11 . A lens-fitted photo film unit as claimed in claim 10 , wherein the following conditions are satisfied:
1/80 sec.≧ T 1 , and 1/30 sec.≧ T 2 ≧ 1/60 sec.
where the shutter speed in said high-speed shutter state is T 1 , and the shutter speed in said low-speed shutter state is T 2 .
12 . A lens-fitted photo film unit without a flash device comprising:
a photo film, preloaded in a factory, having ISO sensitivity of 1600 or above;
a stop device having a small aperture state in which f-number is no less than f13 and a large aperture state in which the f-number is no more than f8;
a shutter device having a high-speed shutter state in which shutter speed is no more than 1/80 second and a low-speed shutter state in which the shutter speed is no less than 1/60 second; and
a mode switching operation member for selecting one of a first photographic mode and a second photographic mode, said first photographic mode establishes said small aperture/high-speed shutter state, said second photographic mode establishes said large aperture/low-speed shutter state.