Variable soft-focus lens

Details Variable soft-focus lens Variable soft-focus lens

1979-10-12

1982-01-12

Corbin, John K.

350472, G02B 934, G02B 1320

Patent

active

043102212

ABSTRACT:
The present invention relates to a lens realizing a soft-focus effect by changing the air space between the front lens group with a positive power and the rear lens group with a negative power, thus increasing selectively the spherical aberration among the Seidel aberrations and maintaining the other aberrations constant. The front lens group consists of a positive meniscus lens with a convex surface at the front side and a positive meniscus lens consisting of a bi-convex lens and a bi-concave lens, being cemented on each other in sequence, while the rear lens group consists of an aperture, a bi-concave lens and a positive lens consisting of a negative and a positive lens being cemented on each other in sequence.

REFERENCES:
patent: 2502509 (1950-04-01), Cook
patent: 4124276 (1978-11-01), Okano et al.

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