Apparatus for adjusting focus in the macro-photographing mode of

Details Apparatus for adjusting focus in the macro-photographing mode of Apparatus for adjusting focus in the macro-photographing mode of

1988-02-24

1989-05-23

Adams, Russell E.

G03B 300

Patent

active

048334979

ABSTRACT:
An apparatus for adjusting the focus in the macro-photographing mode of an automatic focusing camera. The apparatus includes an object distance measuring optical system further including a light emitting lens of a measuring light reflected by an object, a zoom photographing optical system which is moved to the focal point thereof in accordance with the distance data of the light receiving lens and which is, in the macro-photographing mode, at least partially moved by a predetermined amount beyond an extreme focal length in the normal photographing mode, a mask which has an aperture having a center which is offset from the optical axis of the object distance measuring optical system and a prism for deflecting the measuring light which passes through the aperture of the mask toward the light receiver. The mask and the deflecting means are retractably located in front of the light receiver in the macro-photographing mode.

REFERENCES:
patent: 4582411 (1986-04-01), Ohmura et al.
patent: 4660954 (1987-04-01), Fujita et al.
patent: 4682886 (1987-07-01), Toyama et al.

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