Photographic lens system

Details Photographic lens system Photographic lens system

1991-01-17

1992-08-18

Gonzalez, Frank

Optical: systems and elements

Lens

Including a nonspherical surface

359775, G02B 936

Patent

active

051393425

ABSTRACT:
A photographic lens system comprising, in the order from the object side, a first lens component which is designed as a cemented doublet consisting of a positive lens element and a negative lens element in this order, a second lens component which is designed as a cemented doublet consisting of a negative lens element and a positive lens element in this order, and an aperture stop arranged between said first lens component and said second lens component, and using at least the aspherical surface therein. This photographic lens system comprises a small number of lens elements, and has a high aperture ratio and favorably corrected aberrations.

REFERENCES:
patent: 4171872 (1979-10-01), Baker
patent: 4359271 (1982-11-01), Mihara
patent: 4457592 (1984-07-01), Baker
patent: 4561730 (1985-12-01), Lawson et al.

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