Optical system and optical apparatus having the same

Details Optical system and optical apparatus having the same Optical system and optical apparatus having the same

2011-08-16

2011-08-16

Thompson, Timothy J (Department: 2835)

Optical: systems and elements

Lens

With variable magnification

C359S691000

Reexamination Certificate

active

08000026

ABSTRACT:
An zoom lens includes a front unit having positive refractive power, an aperture stop, and a rear unit. The front unit has a positive lens Gp1and the rear unit has a negative lens Gn1. When an Abbe number of a material of the positive lens Gp1, and a partial dispersion ratio of the material thereof for a g-line and an F-line is defined as νdp1and θgFp1respectively, and a refractive index and an Abbe number of a material of the negative lens Gn1for a d-line, and a partial dispersion ratio of the material thereof for the g-line and the F-line is defined as Ndn1νdn1and θgFn1respectively, satisfying the following conditions: 75<νdp1<99, 0.020<θgFp1−0.6438+0.001682×νdp1<0.100, 1.75<Ndn1<2.10, and 0.020<θgFn1−0.6438+0.001682×νdn1<0.100.

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