Telephoto lens system allowing short-distance photographing oper

Details Telephoto lens system allowing short-distance photographing oper Telephoto lens system allowing short-distance photographing oper

1994-03-14

1995-03-28

Sugarman, Scott J.

Optical: systems and elements

Lens

Telephoto

359685, 359686, 359745, 359779, G02B 1302

Patent

active

054022681

ABSTRACT:
A micro lens allowing a short-distance photographing operation from infinity to an equal magnification consists of, in order from the object side, a first lens group including a negative lens and having a positive refracting power, a second lens group having a positive refracting power, a third lens group including a cemented lens (doublet lens) and having a negative refracting power, and a fourth lens group having a positive refracting power. When a focusing operation is performed from infinity to a short distance, the first lens group is nonlinearly moved and the group interval between the second and third lens groups is increased, thereby satisfying required conditions.

REFERENCES:
patent: 4437734 (1984-03-01), Iizuka
patent: 4508433 (1985-04-01), Kitagishi et al.
patent: 4904070 (1990-02-01), Hirakawa

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