Zoom lens and image pickup apparatus having the same

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

2007-06-26

2007-06-26

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

C359S674000

Reexamination Certificate

active

11470111

ABSTRACT:
A zoom lens in which a precise focus detection signal can be detected while a user can observe an image to be shoot without being affected by insertion/removal of an extender lens into an optical axis. A relay lens unit stationary during zooming includes lens unit L21including a branch element, lens unit L22interchangeable with extender lens unit insertable into/removable from optical path to change focal length range of the entire system and positive lens unit L23in order from object side to image side, and the zoom lens satisfies specific conditions among distance from an aperture stop to front principal point of L21, distance from rear principal point of L21to front principal point of L22, distance from rear principal point of L22to front principal point of L23, refractive power of L21, and refractive power of the entire system of the zoom lens at wide-angle end.

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