Inverted telephoto type wide angle lens system with a rear focus

Details Inverted telephoto type wide angle lens system with a rear focus Inverted telephoto type wide angle lens system with a rear focus

1985-12-10

1988-07-26

Corbin, John M.

350463, G02B 1304, G02B 900

Patent

active

047596198

ABSTRACT:
An improvement of an inverted telephoto type wide angle lens system having, from the object to the image side a front lens group of a negative refractive power which is left stationary upon focusing, and a rear lens group of a positive refractive power which is shiftable for the purpose of focusing is disclosed. The improvement is characterized in that the lens system fulfills the following condition:

REFERENCES:
patent: 3473866 (1969-10-01), Kirchhoff
patent: 3884556 (1975-05-01), Nakagawa
patent: 3981563 (1976-09-01), Nakamura
patent: 4029397 (1977-06-01), Yamashita
patent: 4099649 (1978-07-01), Lawson et al.
patent: 4311367 (1982-01-01), Mori
patent: 4382662 (1983-05-01), Tokumaru et al.

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