Large relative aperture objective

Details Large relative aperture objective Large relative aperture objective

1981-08-31

1984-08-07

Corbin, John K.

350431, 350450, G02B 962, G02B 1518

Patent

active

044640234

ABSTRACT:
An objective lens of large relative aperture comprising, from front to rear, a first lens component of positive power, a second lens component of positive power and a third lens component of negative power, the first and third lens components being moved forward as a unit, while the second lens component is simultaneously moved forward by a smaller amount than that of the movement of them to effect focusing from infinity to shorter object distances. The focal lengths of the first, second and third lens components, the calculations of the constituent lenses, and the glass materials of which the lenses are made up are properly chosen so as to achieve a high grade imaging performance throughout a focusing range from infinity to very short object distances.

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