Apparatus for converting interchangeable camera lens from manual

Details Apparatus for converting interchangeable camera lens from manual Apparatus for converting interchangeable camera lens from manual

1986-12-12

1987-12-15

Hix, L. T.

35419512, 354286, 354455, G03B 300

Patent

active

047129000

ABSTRACT:
An apparatus (X) for converting a manual focus interchangeable lens having an associated focal length into an autofocus type lens for use with a microprocessor based autofocus single lens reflex camera (Y) for providing autofocus photography with the manual focus interchangeable lens includes a lens data conversion and output circuit (SC, MP, 17) which converts data concerning the aperture values of the lens into a serial bit pattern representation of the full/minimum aperture value lens characteristics based on the detected minimum aperture value (S.sub.1, S.sub.2) and number of stages of aperture values (S.sub.3, S.sub.4, S.sub.5) for the lens. The converter (X) enables a manual focus lens having a different mount (1, 7) than the camera to be mechanically and electrically coupled to the camera to permit autofocus photography. Digital encoders (19) may be employed with the aperture control ring to detect the minimum aperture value and associated number of stages for the lens.

REFERENCES:
patent: 4627699 (1986-12-01), Takagi

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