Telephoto objective

Details Telephoto objective Telephoto objective

1975-04-22

1977-08-30

Sacher, Paul A.

350214, 350255, G02B 960

Patent

active

040451283

ABSTRACT:
A telephoto objective comprising a stationary convergent front lens group and a rear lens group which includes a lens member axially movable for focusing behind a front lens member which remains stationary during focusing, and an operating mechanism therefor. In order to achieve excellent stability of the various aberrations and particularly spherical aberration throughout the focusing range, compensation for the residual aberrations introduced by the front lens group is concentrated in the stationary front member of the rear lens group, while the movable rear member is configured to provide minimized variation of aberrations by constructing these two members as being divergent with their front surfaces convex to the object. In this particular arrangement, the movable member is moved toward the image plane as the objective is focused from the position for an object at infinity to the position for a close object.

REFERENCES:
patent: 2503789 (1950-04-01), Wood et al.
patent: 3854797 (1974-12-01), Yokota

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