Focus adjusting device for telephotographic lens

Details Focus adjusting device for telephotographic lens Focus adjusting device for telephotographic lens

1976-08-16

1977-10-11

Evans, F. L.

G02B 702

Patent

active

040532119

ABSTRACT:
A focus adjusting device for a telephotographic lens which accomplishes a focusing operation by moving a part of a photographing optical system thereof. The device is provided with a non-linear cam whereby the rotational angle of an operating member is made to be greater for focusing on an object located at a long distance to ensure focusing accuracy and to be smaller for focusing on an object located at a short distance.

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