Telephoto lens

Details Telephoto lens Telephoto lens

1978-06-23

1980-12-23

Sacher, Paul A.

350215, G02G 962, G02B 964

Patent

active

042407036

ABSTRACT:
A telephoto lens having a relatively short focal length compared to what is generally accepted as the focal length of a telephoto lens and corrected for aberrational deviations throughout the focusing range. The lens comprises a positive first (counting from the front) member, negative second and third members, and a positive fourth member. The first member consists of two positive components and one negative component, the frontmost and rearmost lens surfaces of each of said second, third and fourth members being convex and concave to the front and rear respectively, and said fourth member serving to cancel the residuals of spherical aberration and distortion. Focusing down to shorter object distances is performed either by forward axial movement of the entire system, or by rearward axial movement of the third member with the other members being stationary.

REFERENCES:
patent: 4045128 (1977-08-01), Momiyama
patent: 4068929 (1978-01-01), Yokota

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