Patent ID: 7800829

Claim:
A zoom lens composed of plural groups and adapted to change group spacing or spacings to thereby perform magnification changing operation, the zoom lens comprising: a first group at least including a reflection member for bending or folding the optical axis and a negative subgroup at an object side relative to the reflection member, said first group being fixed during magnification changing operation; a second group movably provided during magnification changing operation at an image side of the first group and having negative refractive power; and a third group including a positive lens having non-spherical surfaces at both surface sides thereof, and a light quantity adjustment member at the image surface side, the light quantity adjustment member being fixed during magnification changing operation, wherein the zoom lens is located within a lens barrel and said negative subgroup undergos a lens barrel sinking operation, and wherein, when the negative subgroup is caused to undergo said lens barrel sinking operation, the reflection member is withdrawn by being rotated with a fulcrum which is not limited to one end side of the reflection member, and the negative subgroup of the first groups is accommodated into a space thus vacated by the withdrawn reflection member.