1979-12-18
1982-03-16
Corbin, John K.
G02B 934
Patent
active
043198104
ABSTRACT:
A four-group lens comprises, in succession from the object side, a first group, a second group, a diaphragm, a third group and a fourth group. These four groups are formed substantially symmetrically with respect to the diaphragm. The air space between the first and second groups and the air space between the third and fourth groups are variable in accordance with a change of the photographing magnification.
REFERENCES:
patent: 3672748 (1972-06-01), Doi et al.
patent: 3941457 (1976-03-01), Kawakami
Corbin John K.
Nippon Kogaku K.K.
Sugarman Scott J.
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