Variable lens which can have its focal distance range easily cha

Details Variable lens which can have its focal distance range easily cha Variable lens which can have its focal distance range easily cha

1977-04-05

1979-03-27

Clark, Conrad J.

350184, G02B 1502, G02B 1518

Patent

active

041463056

ABSTRACT:
A variable magnification lens which can have its focal distance range easily changed and has a focusing lens group, a variable lens group and an imaging lens group positioned in said order from an object side, wherein said imaging lens group has a fixed front lens group, a movable middle lens group, a fixed rear lens group in said order from an object side, further an attachment lens is provided in a freely dismountable manner on an optical axis between said front lens group and the rear lens group, and when said attachment lens is mounted said middle lens group is shifted to a prescribed position, thus the focal distance range of the variable magnification lens will be different between a time when the attachment lens is mounted and a time when the same is not mounted.

REFERENCES:
patent: 2906172 (1959-09-01), Klemt
patent: 4015895 (1977-04-01), Hirose

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