Zoom lens and imaging apparatus

An imaging apparatus, comprising:

• a zoom lens;
• an imaging device that converts an optical image formed by the zoom lens into electrical signals;
• a movement detection section that detects an axial inclination of the zoom lens;
• a computing section that computes a correction amount based on a detection by the movement detection section;
• and
• a movement correction drive section that performs a movement correction operation in accordance with the correction amount computed by the computing section, wherein
• the zoom lens includes a front group that includes a plurality of movable lens groups, and a rear group that is provided on the image side of the front group and that includes a negative lens and a positive lens,
• an image side lens surface of the positive lens is a flat surface,
• the positive lens is tiltable about the spherical center of its object side lens surface which is convex on the object side,
• when a lens system is inclined, the positive lens is tilted by angle α in relation to the optical axis of the lens system based on Equation (0) below:
• α=−f θ/[Bf(n−1)] (0),
• where
• α:
• an angle formed between a normal line of the image side lens surface of the positive lens provided within the rear group and the optical axis of the lens system;
• f:
• a focal length of the overall lens system;
• θ:
• an angle of the optical axis of the lens system after being inclined in relation to the optical axis before being inclined;
• Bf:
• a distance between the image side lens surface of the positive lens provided within the rear group and the image plane;
• and
• n:
• a refractive index of the positive lens provided within the rear group.
• the movement detection section detects θ,
• the computing section computes α based on Equation (0), and
• the movement correction drive section tilts the positive lens by α.