Lens system capable of converting focal length by addition of a

Details Lens system capable of converting focal length by addition of a Lens system capable of converting focal length by addition of a

1983-08-11

1987-01-06

Corbin, John K.

350520, G02B 1502

Patent

active

046342354

ABSTRACT:
This invention relates to a lens system which can convert a focal length by adding a converter lens. A rear converter lens having a positive refractive power is added between an image surface rearwardly of a standard or tele-lens system to obtain a wide angle lens. At this time, it is necessary to make the full length of the converter lens small and to prevent an increase in positive Petzval's sum of the converter lens and in negative distortion aberration. In this invention, in case of a wide angle lens, a rear converter lens is used which is composed of three to five lenses having an angle of view, 63.4.degree. and a magnification ratio, more than 1.4.

REFERENCES:
patent: 3817599 (1974-06-01), McCrobie
patent: 4394071 (1983-07-01), Yamada
patent: 4422734 (1983-12-01), Tanaka et al.

Affiliated with

Also associated with

Rating

Lens system capable of converting focal length by addition of a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lens system capable of converting focal length by addition of a , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lens system capable of converting focal length by addition of a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-680285