1976-08-09
1977-11-08
Clark, Conrad J.
G02B 942
Patent
active
040573290
ABSTRACT:
A photographic objective comprises a plurality of lens elements, the outer two of which are adjustable axially by a small amount for fine adjustment of the focal length of the lens system to permit matching mass produced lens systems in pairs so that the focal lengths of every pair of such lenses can be adjusted within very close tolerances.
Bell & Howell Company
Clark Conrad J.
Fitz-Gerald Roger M.
Passman Aaron
Peele, Jr. John E.
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