Large aperture ratio photographic lens

Details Large aperture ratio photographic lens Large aperture ratio photographic lens

1980-05-28

1982-12-21

Corbin, John K.

G02B 962, G02B 1132

Patent

active

043646433

ABSTRACT:
Disclosed is a photographic lens with improved correction for off-axis halo and image plane distortion, and composed of seven lenses in six components. The first component consists of a positive meniscus lens having a convex surface toward the object, the second component a positive meniscus lens having a convex surface toward the object, the third component a negative meniscus lens having a convex surface toward the object, the fourth component a negative meniscus lens consisting of a negative and a positive lens cemented to each other and having a convex surface toward the image as a whole, the fifth component a positive meniscus lens having a convex surface toward the image and the sixth component a bi-convex lens; with the conditions:

REFERENCES:
patent: 3552829 (1971-01-01), Marquardt
patent: 3738736 (1973-06-01), Shimizu

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