Large relative aperture objective lens

Details Large relative aperture objective lens Large relative aperture objective lens

1981-06-16

1984-08-21

Corbin, John K.

350431, G02B 962, G02B 1320

Patent

active

044667108

ABSTRACT:
An objective lens of large relative aperture includes three lens components of positive power arranged to be focused by moving the first and third components in unison forwardly, along with forward movement of the second component by a smaller amount than the movement of the first and third components when focusing down to shorter object distances. Accordingly, aberrations are well corrected throughout an extended range of image magnification.

REFERENCES:
patent: 4165916 (1979-08-01), Nakamura
patent: 4260223 (1981-04-01), Hamanishi

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