| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens excellent in a zoom ratio, the angle of view and an F value and having such high optical specification performance that aberration is restrained to be little and made extremely thin in a depth direction. SOLUTION: The zoom lens is provided with a lens group G1 provided with a prism P including a reflection surface RF for bending an optical path nearest to an object side, having negative refractive power as a whole and fixed at the time of varying power and an aperture diaphragm S positionally immovable with respect to an image pickup surface I at the time of varying power. The optical path incident surface IF of the prism P is concave to the object side and has an aspherical surface whose divergence gets weaker as it is separated from an optical axis. COPYRIGHT: (C)2004,JPO
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