Medium telephoto lens system

Details Medium telephoto lens system Medium telephoto lens system

1989-11-01

1991-10-08

Sugarman, Scott J.

Optical: systems and elements

Lens

Telephoto

G02B 1302

Patent

active

050548999

ABSTRACT:
A telephoto lens system which composed of a front group comprising, in order from the object side, a positive first lens having a convex surface of large curvature directed toward the object, a positive meniscus second lens having a convex surface of large curvature directed toward the object and a negative third lens having a concave surface of large curvature directed toward the image, and a rear group comprising, in order from the object side, a biconvex fourth lens, a biconcave fifth lens, a positive sixth lens and a seventh lens having a weak positive refractive power, all lenses except the seventh lens being moved in unison to effect focusing. The lens system satisfies conditions which result in a light weight lens system having a focal length of about 100 mm and a large effective aperture ratio of 1:2.0, and which is capable of satisfactory compensation for spherical aberration and astigmatism over a shooting range from infinity to close-up at a magnification of about -0.1.times..

REFERENCES:
patent: 4545654 (1985-10-01), Sato
patent: 4812026 (1989-03-01), Iima

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