Internal focus telephoto lens for an auto focus camera

Details Internal focus telephoto lens for an auto focus camera Internal focus telephoto lens for an auto focus camera

1993-12-15

1995-08-01

Epps, Georgia Y.

Optical: systems and elements

Lens

Telephoto

359684, 359745, G02B 1302

Patent

active

054384559

ABSTRACT:
In an internal focus telephoto lens comprised, in succession from the object side, of a first lens unit of positive refractive power, a second lens unit of negative refractive power and a third lens unit of positive refractive power, the first lens unit of positive refractive power and the second lens unit of negative refractive power together forming a substantially afocal system, focusing being effected by the second lens unit, the first lens unit has a front group of positive refractive power and a rear group having weak positive refractive power relative to the front group, the first group being comprised, in succession from the object side, of a positive lens component, a positive lens component and a negative lens component, the second lens unit has, in succession from the object side, at least a negative lens component and a negative lens component, and the third lens unit has a positive lens component, and various predetermined conditions are satisfied.

REFERENCES:
patent: 4176913 (1979-12-01), Nakamura et al.
patent: 4457595 (1984-07-01), Mihara
patent: 4534626 (1985-08-01), Mihara
patent: 5323270 (1994-06-01), Sato

Affiliated with

Also associated with

Rating

Internal focus telephoto lens for an auto focus camera does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Internal focus telephoto lens for an auto focus camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Internal focus telephoto lens for an auto focus camera will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-737344