Wide angle lens

Details Wide angle lens Wide angle lens

1998-01-20

1999-09-07

Font, Frank G.

Optical: systems and elements

Lens

Reverse telephoto

359716, G02B 1304, G02B 302

Patent

active

059495880

ABSTRACT:
A super-wide angle lens, sequentially from an object side, comprises a first negative lens L1, a second negative lens L2, and a third positive lens L3. The first negative lens L1 with its concave surface toward an image side has an image-side surface with a curvature larger than that on an object-side surface. The second negative lens L2 is disposed at a predetermined spacing from the first negative lens L1 and takes a negative meniscus shape with its convex surface toward the object side. The third positive lens L3 has its convex surface toward the object side.

REFERENCES:
patent: 4525038 (1985-06-01), Muller

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