1977-01-06
1978-07-18
Clark, Conrad J.
G02B 960
Patent
active
041012038
ABSTRACT:
An improved Gauss type lens system having a long back focal length with a relatively high aperture ratio is provided. The Gauss type lens system can comprise a five group, seven lens element system wherein the overall length of the lens system is less than 90 percent of its focal length. The Gauss type lens system has design parameters within the following ranges, wherein the sub-numbers refer to respective lens characteristics, sequentially measured from the object to image side:
REFERENCES:
patent: 2735339 (1956-02-01), Yoshikazu
patent: 3560079 (1971-02-01), Wakimoto et al.
patent: 3617111 (1971-11-01), Kawazu
patent: 3634001 (1972-01-01), Shimada
patent: 3815974 (1974-06-01), Momiyama
Clark Conrad J.
Jackson Harold L.
Jones Stanley R.
Minolta Camera Kabushiki Kaisha
Price Joseph W.
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