Retrofocus-type wide angle lens system having a fixed front lens

Optical: systems and elements – Lens – Reverse telephoto

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Details

359749, 359751, 359755, 359761, G02B 1304

Patent

active

055899889

ABSTRACT:
A wide angle lens system comprises a front lens group and a rear lens group having positive refractive power. The front lens group includes in the order from the object side, a negative meniscus lens component having a convex surface facing the object side, a cemented lens component having a negative lens element and a positive lens element and a convex cemented surface facing the object side. The rear lens group includes a cemented lens component having a positive lens element and a negative lens element and a convex surface facing the object side. The rear lens group is moved toward the object side for focusing operation from the infinite object distance to the shortest object distance.

REFERENCES:
patent: 3738738 (1973-06-01), Takahashi
patent: 3829198 (1974-08-01), Takahashi
patent: 3975090 (1976-08-01), Lawson
patent: 3992085 (1976-11-01), Momiyama
patent: 3999840 (1976-12-01), Momiyama
patent: 5218480 (1993-06-01), Moskovich
patent: 5321554 (1994-06-01), Ishiyama et al.

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