Camera system including rear conversion lens

Details Camera system including rear conversion lens Camera system including rear conversion lens

1991-12-09

1993-07-27

Gellner, Michael L.

G03B 300

Patent

active

052314448

ABSTRACT:
A camera system and a rear conversion lens both of which accurately calculate the distance .DELTA.X a focusing lens moves when the rear conversion lens is interposed between an interchangeable lens and the camera body, even when the distance .DELTA.Bf an image surface of the focusing lens shifts, increases, so that a subject can be focused quickly.
A factor K.sub.0 for converting the distance the image surface of an interchangeable lens shifts and a factor C.sub.0 for correcting the conversion factor K.sub.0 are stored, and the magnification .beta.c and the focal length fc of the rear conversion lens are also stored independently of the above two factors. The distance .DELTA.X is calculated with precision. The subject can thus be automatically focused smoothly and quickly.

REFERENCES:
patent: 4572638 (1986-02-01), Nakai et al.
patent: 4841325 (1989-06-01), Hoshino et al.
patent: 4881094 (1989-11-01), Terui et al.
patent: 4908645 (1990-03-01), Higashihara et al.

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