Retrofocus-type wide angle lens system having a fixed front lens

Details Retrofocus-type wide angle lens system having a fixed front lens Retrofocus-type wide angle lens system having a fixed front lens

1995-12-07

1996-12-31

Nelms, David C.

Optical: systems and elements

Lens

Reverse telephoto

359749, 359751, 359755, 359761, G02B 1304

Patent

active

055899889

ABSTRACT:
A wide angle lens system comprises a front lens group and a rear lens group having positive refractive power. The front lens group includes in the order from the object side, a negative meniscus lens component having a convex surface facing the object side, a cemented lens component having a negative lens element and a positive lens element and a convex cemented surface facing the object side. The rear lens group includes a cemented lens component having a positive lens element and a negative lens element and a convex surface facing the object side. The rear lens group is moved toward the object side for focusing operation from the infinite object distance to the shortest object distance.

REFERENCES:
patent: 3738738 (1973-06-01), Takahashi
patent: 3829198 (1974-08-01), Takahashi
patent: 3975090 (1976-08-01), Lawson
patent: 3992085 (1976-11-01), Momiyama
patent: 3999840 (1976-12-01), Momiyama
patent: 5218480 (1993-06-01), Moskovich
patent: 5321554 (1994-06-01), Ishiyama et al.

Affiliated with

Also associated with

Rating

Retrofocus-type wide angle lens system having a fixed front lens does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Retrofocus-type wide angle lens system having a fixed front lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Retrofocus-type wide angle lens system having a fixed front lens will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1145999