Three field of view refractive afocal telescope

Details Three field of view refractive afocal telescope Three field of view refractive afocal telescope

1992-03-09

1993-07-20

Lerner, Martin

Optical: systems and elements

Having significant infrared or ultraviolet property

Including alternative optical path or optical element

359357, 359566, 359674, G02B 518, G02B 1314, G02B 1502

Patent

active

052298809

ABSTRACT:
An infrared refractive reimaging afocal telescope (10) has an objective lens group (12), an eyepiece lens group (14), and a switching lens group (16). The system (10) provides a plurality of magnification modes in a compact arrangement. The system (10) utilizes lenses (40, 42, 44, 46) with diffractive surfaces to provide for magnification changes and chromatic aberration correction. The system provides for excellent image quality in all modes using a minimum number of lens elements.

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