Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2011-02-15
2011-02-15
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S557000, C359S683000, C359S684000, C359S685000, C359S716000, C359S740000, C359S785000
Reexamination Certificate
active
07889440
ABSTRACT:
A zoom lens ZL installed in a single-lens reflex digital camera1and the like includes, in order from an object side, a first lens group G1having positive refractive power, a second lens group G2having negative refractive power, and a rear lens group GR having positive refractive power. The second lens group G2includes at least one positive lens and a negative lens disposed adjacent to the object side of the positive lens having largest refractive power among the positive lenses. Each distance between lens groups varies upon zooming from a wide-angle end state and a telephoto end state. Thereby providing a zoom lens having excellent optical performance, an optical apparatus equipped the zoom lens, and a method for manufacturing the zoom lens.
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Miwa Satoshi
Sato Haruo
Suzuki Takeshi
Yamamoto Hiroshi
Lester Evelyn A.
Miles & Stockbridge P.C.
Nkon Corporation
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