Four-group lens

Details Four-group lens Four-group lens

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

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