Retro-focus type wide angle objective lens

Details Retro-focus type wide angle objective lens Retro-focus type wide angle objective lens

1975-10-10

1977-05-24

Corbin, John K.

G02B 1304

Patent

active

040251705

ABSTRACT:
A retrofocus type wide angle objective lens comprising a negative lens group N and a positive lens group P having a diaphragm therein arranged in this order from the object side, said negative lens group N being constructed from a divergent front lens group F and a rear lens group R. When the lens is focused to a close object, only the rear lens group R located in the divergent light bundle from said front lens group F is moved in a different manner from that in which the other lens groups are moved in unison to effect good correction of aberrations in close photography.

REFERENCES:
patent: 3748021 (1973-07-01), Tajima et al.
patent: 3923369 (1975-12-01), Nakamura

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