Optical system for focal length conversion

Details Optical system for focal length conversion Optical system for focal length conversion

1981-11-09

1984-06-26

Corbin, John K.

G02B 1512

Patent

active

044563400

ABSTRACT:
An optical system has a convertible focal length. A positive lens system having a positive refractive power is supplemented by a negative lens system having a negative refractive power between said positive lens system and an image plane to convert the focal length. The front principal point of the aforesaid negative lens system thereby assumes a position rearwardly of the rear principal point thereof, and is made to lie rearwardly of the rear principal point of the aforesaid positive lens system. The overall length of the aforesaid negative lens system is longer than 0.1 times but shorter than 0.5 times the back focus of the aforesaid positive lens system.

REFERENCES:
patent: 4239340 (1980-12-01), Ogino
patent: 4253736 (1981-03-01), Momiyama
patent: 4340279 (1982-07-01), Ikemori

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