Large aperture photographic objective

Details Large aperture photographic objective Large aperture photographic objective

1974-07-03

1976-03-16

Corbin, John K.

350206, G02B 934

Patent

active

039443396

ABSTRACT:
A photographic objective lens system for adaption with a diaphragm located in front of the entire system. The lens system comprises positive front and rear lenses and a negative intermediate lens in optical alignment with each other. The front lens is in the form of a positive meniscus doublet composed of a double convex lens and double concave lens cemented together at their adjoining surfaces. The intermediate lens is a double concave singlet. The rear lens consists of a positive meniscus front singlet of rearward convexity and a positive meniscus rear singlet of forward convexity. This objective is so designed as to have a relative aperture of at most two in F-number and a field angle as wide as 44.degree. while nevertheless preserving an excellent state of correction of various aberrations.

REFERENCES:
patent: 1955617 (1934-04-01), Warmisham
patent: 3011402 (1961-12-01), Johnson
patent: 3466115 (1969-09-01), Ruben

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