Telephoto zoom lens for 35 mm photos

Details Telephoto zoom lens for 35 mm photos Telephoto zoom lens for 35 mm photos

1994-03-09

1996-04-16

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359765, 359763, 359714, G02B 1514

Patent

active

055088473

ABSTRACT:
A telephoto zoom lens, sequentially from an object, comprising: a first lens group having positive refracting power; a second lens group having negative refracting power; a third lens group having negative refracting power; a fourth lens group having positive refracting power; and a fifth lens group having negative refracting power. During variable power from a wide-angle end to a telephoto end, the lens groups move so that a space dimension between the first and second lens groups increases, a space dimension between the second and third lens groups changes linearly or nonlinearly, and a space dimension between the fourth and fifth lens groups decreases. The zoom lens satisfies various conditions.

REFERENCES:
patent: 4550987 (1985-11-01), Tachihara

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