Retrofocus lens system and image-taking device

Details Retrofocus lens system and image-taking device Retrofocus lens system and image-taking device

2007-02-12

2010-02-02

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S749000

Reexamination Certificate

active

07656591

ABSTRACT:
Providing a retrofocus lens system and an image-taking device having small variation in aberrations upon focusing on a close object with a high imaging magnification. The retrofocus lens system includes, in order from an object, a first lens group G1having negative refractive power, a second lens group G2having negative refractive power, and a third lens group G3having positive refractive power. Upon focusing from infinity to a close object, the first lens group G1,the second lens group G2,and the third lens group G3are moved to the object such that a distance between the first lens group G1and the second lens group G2increases, and a distance between the second lens group G2and the third lens group G3decreases.

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