Long focal length microlens system

Details Long focal length microlens system Long focal length microlens system

1996-02-02

1998-11-03

Nelms, David C.

Optical: systems and elements

Lens

Telephoto

359684, G02B 1302

Patent

active

058317759

ABSTRACT:
A long focal length microlens system that controls the variation of the aberration from the infinite object distance to shooting at equal magnification. The long focal length microlens system includes a first lens group G1 of positive refractive power a second lens group G2 of positive refractive power and a third lens group G3 of negative refractive power. When focusing from a infinite object distance to a close shooting distance, a value of D1 is reduced while a value of D2 is increased and a condition of 0.16<.vertline..DELTA.D1 .vertline./.DELTA.D2<0.5 is satisfied where D1 is a gap of lens apexes between said first group G1 and the second group G2. D2 is a gap of lens apexes between said second group G2 and the third group G3, .DELTA.D1 is (D1 at any object distance)-(D1 in the infinite object distance) and .DELTA.D2 is (D2 at any shooting distance)-(D2 in the infinite object distance).

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