Bright photographic lens system with rear stop diaphragm

Details Bright photographic lens system with rear stop diaphragm Bright photographic lens system with rear stop diaphragm

1979-11-15

1981-06-23

Sacher, Paul A.

G02B 962

Patent

active

042747112

ABSTRACT:
A photographic lens system such as a telescopic lens system adapted for use with a rear stop diaphragm in which the backfocus is about 0.3F, the F number is about F/2.8, the system is small in size and aberrations are well compensated for. Front and rear lens groups are provided with the front group including in order from the object positive, negative, positive and positive lenses while the rear group includes negative and positive lenses. Preferred focal lengths, radii of curvature, refractive indices, and Abbe numbers for each of the lenses are disclosed.

REFERENCES:
patent: 2861500 (1958-11-01), Tronnier

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