Objective of great overall length

Details Objective of great overall length Objective of great overall length

1987-08-31

1989-03-28

Arnold, Bruce Y.

350463, G02B 962

Patent

active

048158348

ABSTRACT:
An objective of great overall length having two lens groups with a positive lens power and an aperture disposed in front of or within of the first lens group. The first lens group includes a positive lens and a negative lens. The second lens group has at least four lens components with lens powers of positive, negative, positive and negative, respectively the distance between the two lens groups being greater than the focal length of the objective. Additionally, the lens components of the second lens group satisfy the following conditions:

REFERENCES:
patent: 2989895 (1961-06-01), Sandback
patent: 3106598 (1963-10-01), Buzawa

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