Zoom lens system and image pickup apparatus having the same

Details Zoom lens system and image pickup apparatus having the same Zoom lens system and image pickup apparatus having the same

2007-03-20

2007-03-20

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S687000, C359S686000

Reexamination Certificate

active

11044883

ABSTRACT:
Disclosed is a zoom lens system, in order from an object side to an image side, including: a first lens unit having a positive optical power; a second lens unit having a negative optical power; a third lens unit having a positive optical power; and a fourth lens unit having a positive optical power, in which during zooming, intervals of the lens units are changed. In such a zoom lens system, a material having a large refractive index is adopted for a material constituting a negative lens element disposed on the most object side in the second lens unit, whereby high optical performance is realized while the whole lens system is miniaturized.

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