Fully automatic diaphragm control interchangeable lens

Details Fully automatic diaphragm control interchangeable lens Fully automatic diaphragm control interchangeable lens

1985-05-16

1987-03-03

Perkey, William B.

35428912, G03B 720

Patent

active

046471715

ABSTRACT:
An interchangeable variable aperture lens can be used as an automatic lens with a camera body using digital signal control and with a camera body using analog signal control, and as a manual lens. The lens has both digital and analogue circuits for providing signals, to different camera bodies, indicative of the full open and full closed values of the lens diaphragm. Digital and analogue signal contacts are so positioned on the lens that the coacting contacts of different camera bodies are engaged when the lens is mounted on the different bodies, provided that the mechanical mount is the same.

REFERENCES:
patent: 4104649 (1978-08-01), Tanaka et al.
patent: 4357089 (1982-11-01), Okura et al.
patent: 4360255 (1982-11-01), Kawasaki

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