Patent
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.
Canon Kabushiki Kaisha
Evans F. L.
LandOfFree
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