Photographic objectives of relatively large aperture

Details Photographic objectives of relatively large aperture Photographic objectives of relatively large aperture

1981-08-31

1983-06-28

Corbin, John K.

G02B 960

Patent

active

043902510

ABSTRACT:
The disclosed objective includes a first lens group of positive power and a second lens group of positive power, the first group having, from front to rear, a positive lens with its front surface convex toward the front, a positive meniscus lens of forward convexity, and a negative meniscus lens of rearward convexity, the second lens group having a cemented lens and a positive lens, with the cemented lens composed of a negative lens and a positive lens. When focusing down from infinity toward closer distances, the lens groups are moved forward while the air separation between the lens groups is simultaneously widened. The glasses of the lenses in the first lens group and the characteristics of the lenses in the second lens group are selected to achieve good aberrational correction throughout the focusing range from infinity to close distances.

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