Objective of great overall length
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 28, 1989
Grant Date -
N/A
app pub date -
Aug 31, 1987
filing date -
Aug 30, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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: R.sub.21
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