Soft-focus lens system

Details Soft-focus lens system Soft-focus lens system

1989-02-17

1990-08-14

Sugarman, Scott J.

350470, 350476, 350480, G02B 1320, G02B 908, G02B 918, G02B 936

Patent

active

049482360

ABSTRACT:
A soft-focus lens system can be composed of, in order from the object side, a front group having a one-group-two-element or two-group-two-element composition of a positive and negative lens element with a positive overall power and a rear group having a one-group-two-element or two-group-two-element composition of a negative and a positive power. If conditions of the system are such that the system has a brightness in the range of 1:2.8 to 1:3.5 in terms of F number and a viewing angle of about 40 degrees, a desired soft-focus effect over the entire picture is produced.

REFERENCES:
patent: 4310221 (1982-01-01), Momiyama et al.

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