Enlargement photographing apparatus

Details Enlargement photographing apparatus Enlargement photographing apparatus

1994-05-04

1997-01-14

Mathews, A. A.

Photography

Having variable focal length of camera objective

Power zoom

359705, 359823, 396 88, 396542, G03B 1332, G02B 7105

Patent

active

055945171

ABSTRACT:
An enlargement photographing apparatus of this invention, arranged between photographing lenses and a camera body, comprises a distance changing unit extending and retracting in an optical-axis direction for changing a distance between the photographing lenses and the camera body, a feeding-quantity detecting unit for detecting a quantity of feeding with respect to a reference position of the distance changing unit, a computing unit for computing a photographing scale factor on the basis of output information of the feeding-quantity detecting unit. information regarding the photographing lenses and the camera body and information of a reference length of the distance changing unit which is arranged on the enlargement photographing apparatus, and a display unit for displaying the photographing scale factor on the basis of an output from the computing unit.

REFERENCES:
patent: 3851952 (1974-12-01), Werz et al.
patent: 4213686 (1980-07-01), Kellner
patent: 4255020 (1981-03-01), Yokio
patent: 4332444 (1982-06-01), Nozawa et al.
patent: 4870436 (1989-09-01), Tanaka
patent: 5077569 (1991-12-01), Notagashira et al.

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