Large aperture, medium telephoto lens system

Details Large aperture, medium telephoto lens system Large aperture, medium telephoto lens system

1992-04-14

1992-12-15

Sugarman, Scott J.

Optical: systems and elements

Lens

Telephoto

359746, G02B 1302

Patent

active

051722747

ABSTRACT:
A large aperture, medium telephoto lens system is disclosed which is composed of a front group G.sub.F that comprises, in order from the object side, at least two positive lens elements having a strong convex surface directed toward the object and a negative lens having a strong concave surface directed toward the image and which has a positive overall refractive power, and a rear group G.sub.R with a surface S.sub.R1 which is the closest to the object being convex toward the object and which the a positive overall refractive power, with only the rear group G.sub.R being moved along the optical axis to perform focusing operations.

REFERENCES:
patent: 3948584 (1976-04-01), Basista et al.

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