Retro-focus type wide angle lens

Details Retro-focus type wide angle lens Retro-focus type wide angle lens

G - Physics

02

B

88/105

G02B 9/00 (2006.01) G02B 13/04 (2006.01)

Patent

CA 1202509

ABSTRACT OF THE DISCLOSURE A retro-focus type wide angle lens having in succession from an object side a first negative meniscus lens having its convex surface facing the object side, a second positive lens, a third biconvex lens, a fourth negative doublet consisting of a biconvex lens and a biconcave lens, a fifth positive lens, and a sixth positive lens is disclosed. Although this retro-focus type wide angle lens is formed of six lens groups and seven lens components, its field angle or angle of view is about 66°, its aperture ratio is 1:1.6, its total length is very short, the aperture of its first divergent lens group is very small and its various aberrations are satisfactorily compensated for.

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