Telephoto lens system

Details Telephoto lens system Telephoto lens system

1976-03-11

1977-12-13

Clark, Conrad J.

G02B 1302

Patent

active

040626300

ABSTRACT:
A telephoto lens system having a relatively large aperture is composed of six lenses collected into four lens members, successively arranged, from the object side of the system to the image side, as follows: a first lens member including a positive lens whose convex surface faces the object side; a second lens member including a negative meniscus lens whose convex surface faces the object side and, a positive meniscus lens cemented to the negative meniscus lens; a third lens member including a positive lens whose convex surface faces the image side, and a biconcave lens cemented to the positive lens; and a fourth lens member consisting of a positive lens.
The aberrations of the telephoto lens system of the invention are reduced even though the aperture is relatively larger than the apertures of prior art lens.

REFERENCES:
patent: 2481688 (1949-09-01), Schade et al.

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