Fast photographic lens system

Details Fast photographic lens system Fast photographic lens system

G - Physics

02

B

G02B 9/64 (2006.01) G02B 9/62 (2006.01)

Patent

CA 2184883

A fast photographic lens system comprises a first lens having a positive refractive power, a convex- shaped outer face and a flat inner face; a second lens having a positive refractive power, a convex-shaped outer face and a concave-shaped inner face; a third lens having a negative refractive power, a slightly convex-shaped outer face, and a concave-shaped inner face; a fourth lens having a negative refractive power and a concave-shaped inner face; a fifth lens, joined with the fourth lens, and having a positive refractive power, a relatively flat inner face and a convex- shaped outer face; a sixth lens having a positive refractive power, a slightly concave-shaped inner face and a convex-shaped outer face; and a seventh lens, having both convex-shaped inner and outer faces.

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