Wide-angle retrofocus lens system

Details Wide-angle retrofocus lens system Wide-angle retrofocus lens system

1978-05-25

1980-11-25

Clark, Conrad J.

G02B 1304

Patent

active

042355206

ABSTRACT:
A wide-angle retrofocus lens system comprises a first lens component comprising a positive meniscus lens having its convex surface on the object side, a second lens component comprising a negative meniscus lens having its convex surface on the object side, a third lens component comprising a positive cemented lens component of a positive lens and a negative lens, a fourth lens component comprising a negative lens, a fifth lens component comprising a positive meniscus lens having its convex surface on the image side, and a sixth lens component comprising a positive lens. The system is arranged to satisfy the predetermined conditions so that, despite the use of a small number of component lenses, the overall length of the system can be made short, the back focal length long and various aberrations are well-corrected over a wide angle of image field.

REFERENCES:
patent: 3955883 (1976-05-01), Sugiyama
patent: 4099850 (1978-07-01), Matsui

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