Telephoto lens system capable of closeup shooting

Details Telephoto lens system capable of closeup shooting Telephoto lens system capable of closeup shooting

1987-03-27

1988-09-13

Corbin, John K.

G02B 964, G02B 1302

Patent

active

047705167

ABSTRACT:
A telephoto lens system which can focus down to unity magnification comprising two lens groups that are displaced during focusing. The front lens group of positive refractive power has five or six elements, namely, a positive lens, a positive meniscus lens, a negative lens, a lens element with a slightly negative refractive power and a positive lens. The rear lens group of negative refractive power has three elements, namely, a positive, a negative and a positive lens element. Additionally, there are four numerical conditions on focal lengths and radii of curvature.

REFERENCES:
patent: 4508433 (1985-04-01), Kitagishi et al.

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