Zoom lens and image capturing apparatus having the same

An image capturing apparatus comprising:

• a zoom lens;
• a solid-state image sensor which photoelectrically converts an image formed by said zoom lens;
• processing unit configured to process image data obtained by said solid-state image sensor;
• and
• correction unit configured to process the image data from said processing unit to correct distortion aberration of the image formed by said zoom lens, and output the corrected image data,
• wherein said zoom lens has, sequentially from an object side to an image side, a first lens unit of negative refractive power and a second lens unit of positive refractive power,
• said lens units move to narrow an interval between said first lens unit and said second lens unit in zooming from the wide-angle end to the telephoto end,
• said first lens unit includes one negative lens and one positive lens,
• said correction unit corrects distortion aberration in accordance with each zoom position of said zoom lens,
• when said correction unit is to correct negative distortion aberration, said correction unit performs correction using image information obtained from area A smaller than a maximum image capturing area of said solid-state image sensor, and a size of a diagonal line of area A at this time is defined as a length of a diagonal line of an image capturing area, and when said correction unit does not correct negative distortion aberration, a size of a diagonal line of the maximum image capturing area of said solid-state image sensor is defined as a length of a diagonal line of an image capturing area,
• letting Ldw and Ldt be lengths of diagonal lines of image capturing areas on the wide-angle end and the telephoto end, f1 be a focal length of said first lens unit of said zoom lens, f2 be a focal length of said second lens unit, fw be a focal length of an entire system on the wide-angle end, R11 and R12 be radii of curvature of an object-side lens surface and image-side lens surface of said negative lens of said first lens unit (for an aspherical surface, radii of curvature of reference spherical surfaces), and D be an outer diameter of a most object-side lens of said first lens unit, conditions:
• 1.7<f1/fw<2.4
• 1.6<f2/fw<2.5
• 0.80<Ldw/Ldt<0.96
• 2.0<(R11×R12)/(D×Ldw)<20.0
• are satisfied, and
• letting R21 and R22 be radii of curvature of an object-side lens surface and image-side lens surface of said positive lens of said first lens unit (for an aspherical surface, radii of curvature of reference spherical surfaces), a condition:
• 1.2<(R21×R22)/(D×Ldw)<3.0
• is satisfied.