Rear converter lens

Details Rear converter lens Rear converter lens

1993-01-12

1994-09-20

Look, Edward K.

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

359784, G02B 1508

Patent

active

053494741

ABSTRACT:
The invention is directed to a compact rear converter lens that has a high zoom ratio of the order of 1.7 to 2.0, is corrected in terms of various aberrations in a well-balanced manner, is little affected by production errors, and is made so compact that it can be built in a compact camera. This rear converter lens that has a negative focal length comprises three lenses or a first lens of negative power, a second lens of positive power and a third lens of negative power, conforms to

REFERENCES:
patent: 4206971 (1980-06-01), Hamanishi et al.
patent: 4643536 (1987-02-01), Yamada et al.

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