From the fish eye lens system and fish eye zoom lens

摘要

PROBLEM TO BE SOLVED: To provide a fisheye lens system and a fisheye zoom lens system for a digital camera, configured in a small size while having a back focus of about the same degree as that of a 35 mm film camera, and having favorably compensated various aberrations including chromatic aberration of magnification.;SOLUTION: The fisheye zoom lens system includes in order from an object side, a first lens group of negative power and a second lens group of positive power which are divided at a position of the maximum air interval at a short focal length extremity, and the interval between the first lens group and the second lens group reduces during variation of magnification from the short focal length extremity to a long focal length extremity. In the fisheye zoom lens system, the first lens group has in order from an object side, a first negative meniscus lens convex on the object side, a second negative meniscus lens convex on the object side, and a third negative lens, and satisfies a conditional expression relating to the shaping factor of each of the negative lenses.;COPYRIGHT: (C)2012,JPO&INPIT