Compact small format lens system

Details Compact small format lens system Compact small format lens system

1996-09-30

1998-06-16

Font, Frank G.

Optical: systems and elements

Lens

With variable magnification

359784, 359787, G02B 15177

Patent

active

057680302

ABSTRACT:
A lens system particularly suitable for use in a camera using small format film has two lens units, a front negative power lens unit and a rear positive power lens unit. The rear lens unit has no negative lens elements and includes an aspheric surface and a diffractive surface.

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patent: 4210388 (1980-07-01), Ikeda
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patent: 5473473 (1995-12-01), Estelle et al.
patent: 5475536 (1995-12-01), Kikutani
patent: 5504618 (1996-04-01), Hirs et al.
patent: 5508848 (1996-04-01), Inoue
patent: 5552936 (1996-09-01), Ohno
patent: 5619380 (1997-04-01), Ogasawara et al.

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