Zoom lens having two movable lens groups

Details Zoom lens having two movable lens groups Zoom lens having two movable lens groups

1978-04-24

1981-11-10

Clark, Conrad J.

G02B 1516

Patent

active

042994527

ABSTRACT:
The present invention relates to a photographic lens capable of zooming by independently moving the front lens group and the rear lens group. The front lens group presents a negative meniscus lens, a biconcave lens and a positive lens, while the rear lens group presents two positive lenses, a positive meniscus lens, a biconcave lens and a positive lens. Let the focal length of the front lens group be Fl, the longest focal length of the total system be Ft and the distance between the secondary principal point of the front lens group and the primary principal point of the rear lens group when the focal length is Et, the zoom lens satisfies the following relations. ##EQU1##

REFERENCES:
patent: 3848969 (1974-11-01), Tajima
patent: 4142779 (1979-03-01), Ogawa
patent: 4147410 (1979-04-01), Shimomura
patent: 4153338 (1979-05-01), Fuji
patent: 4153339 (1979-05-01), Tajima et al.
patent: 4155629 (1979-05-01), Nakamura
patent: 4169660 (1979-10-01), Nakamura

Affiliated with

Also associated with

Rating

Zoom lens having two movable lens groups 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 having two movable lens groups, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens having two movable lens groups will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2359856