Focal length changeable camera

Details Focal length changeable camera Focal length changeable camera

1984-03-27

1985-08-20

Perkey, William B.

354268, G03B 300, G03B 1738

Patent

active

045360685

ABSTRACT:
A camera having an objective lens system with a master lens in a standard operative position constituting a first focal length lens system. When the master lens is moved forward to a telephoto position, an auxiliary lens is automatically inserted into and seated in a space behind the master lens in axial alignment therewith, whereby a second focal length lens system is formed. In such camera, the master lens is made movable to a certain position intervening between the standard and telephoto positions, while maintaining the auxiliary lens stationary in the retracted position from the rear optical path of the master lens. With the master lens in the intermediate position, when a close-up mode selector switch is actuated, the master lens is locked in that intermediate position.

REFERENCES:
patent: 3903537 (1975-09-01), Ettischer
patent: 4214829 (1980-07-01), Ohashi

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