Fixed focus camera shooting hyperfocal distance

Details Fixed focus camera shooting hyperfocal distance Fixed focus camera shooting hyperfocal distance

1997-05-27

1998-06-23

Perkey, W. B.

Photography

Exposure control system responsive to distance

G03B 300

Patent

active

057714088

ABSTRACT:
A fixed focus camera is arranged to shorten the minimum object distance for shooting by moving a lens section to a hyperfocal distance position. The camera is arranged to mount the objective lens system and the diaphragm member on the same tube, the lens system being formed to provide fixed focus, the diaphragm member being provided with a rotating member which is rotated to reduce light from the lens system, and to connect the tube to the body with a helicoid screw so that the rotation of the tube opens and closes the diaphragm member, and moves the lens system back and forth. Then, when the diaphragm opening is reduced by the rotations of the tube, the objective lens system is moved forward to a position where the subject is captured at a hyperfocal distance. This enables it to perform shooting at a hyperfocal distance, whereby the minimum object distance for shooting can be shortened when the diaphragm opening is reduced.

REFERENCES:
patent: 3997906 (1976-12-01), Kashiwase
patent: 4274725 (1981-06-01), Gross
patent: 4316658 (1982-02-01), Bundschuh et al.

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