JPH03100830U - - Google Patents

Description

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the present invention, Figure 2 is a plan cross-sectional view of the main parts of an embodiment of the invention, Figure 3 is its front view, and Figures 4 and 5 are parts of Figure 3. FIG. 6 is a plan sectional view of another embodiment, and FIG. 7 is a front view thereof. 1...Photographing lens, 2...Film, 3...Optical axis, B...ISO sensitivity switching body, 4a, 4b, 4c
, 4d, 4e...Aperture, 5a, 5b, 5c, 5d
...Parallel plane glass plate.

Claims (1)

[Scope of utility model registration request] In a camera with a fixed photographic lens, the actual optical distance from the photographic lens to the film is adjusted according to the aperture size so that the depth of field, which changes depending on the aperture size, is not wasted at infinity. In order to make the most effective use of the depth of field created by each aperture, and to change the effective optical distance from the photographing lens to the film, it is necessary to By attaching and detaching the flat glass immediately after the photographic lens at right angles to its optical axis, an effect similar to that of changing the focal position by moving the photographic lens can be obtained, and the effect that changes depending on each aperture can be obtained. A camera that makes maximum use of depth of field to sharpen images from close range to infinity.