Attachment lens system

Details Attachment lens system Attachment lens system

1982-11-12

1984-10-23

Corbin, John K.

350422, 350469, G02B 964, G02B 1502

Patent

active

044784970

ABSTRACT:
An attachment lens system arranged to be used by attaching on the image side of a master lens system and comprising a front lens group and a rear lens group wherein the front lens group comprises first and second lens components and the rear lens group comprises a third lens component, the first lens component being a cemented doublet consisting of a negative meniscus lens and a biconvex lens and having positive refractive power, the second lens component being a biconcave lens, the third lens component comprising two lens elements, i.e., a biconvex lens and a biconcave lens, the attachment lens system enabling to use it in combination with a large aperture ratio telephoto lens system of F/2.0 class and having favorably corrected Petzval's sum, spherical aberration, coma and so forth.

REFERENCES:
patent: 4206971 (1980-06-01), Hamanishi et al.

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