Zoom lens barrel capable of macro-photography

Details Zoom lens barrel capable of macro-photography Zoom lens barrel capable of macro-photography

1976-11-05

1978-09-19

Bentley, Stephen C.

350184, G02B 1500

Patent

active

041149840

ABSTRACT:
The disclosure describes a zoom lens barrel capable of macro-photography on which a special switch ring is provided. The switch ring is externally operable and has a cam slot comprising zooming portion and macro portion.
The zoom portion is shaped to allow either of a compensator lens group or a variator lens group to move toward the direction of the optical axis of lens whereas the macro portion is so shaped not to allow it. Upon the rotation of the switch ring, a direct switchover from zooming portion to macro portion is made so as to permit macro-photography at any desired focal length.

REFERENCES:
patent: 3731987 (1973-05-01), Iida
patent: 3817600 (1974-06-01), Watanabe
patent: 3877793 (1975-04-01), Nakagawa

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