Zoom lens system

Details Zoom lens system Zoom lens system

1981-11-04

1985-01-08

Corbin, John K.

350427, G02B 1514, G02B 1518

Patent

active

044924372

ABSTRACT:
A zoom lens system with an improved focusing system is provided. The zoom lens system comprises, from the object to the image side, a front lens group, a zooming lens group including at least a movable lens group, and a macroscopically fixed rear lens group including an aperture stop located inclining towards the object side and a focusing lens group movable on the image side of the aperture stop, wherein the lens system fulfills the following condition: ##EQU1## wherein, f.sub.F represents the focal length of the focusing lens group in the rear lens group, f.sub.III represents the focal length of the whole rear lens group upon infinity focusing, and .gamma. represents the zoom ratio of the zoom lens system.

REFERENCES:
patent: 3972056 (1976-07-01), Tsujimoto et al.
patent: 4045128 (1977-08-01), Momiyama
patent: 4068929 (1978-01-01), Yokota
Betensky et al., "Continuous Close Focusing Telephoto Zoom Lenses", SPIE, vol. 237, 1980 Intl. Lens Design Conf., pp. 488-496.

Affiliated with

Also associated with

Rating

Zoom lens system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zoom lens system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-111317