Focusing method null of the approach photographing lens, the photographing device and the approach photographing

摘要

PROBLEM TO BE SOLVED: To provide a close-up lens with superb optical performance capable of focusing from infinity to a close distance allowing a life-size magnification by an internal focusing system with small moving amounts of focusing lens groups, an imaging apparatus, and a method for focusing a close-up lens.;SOLUTION: The close-up lens includes the four lens groups, and is able to photograph an object with an imaging magnification from β=0 through at least β=-0.5, wherein upon focusing, a first lens group G1 and a fourth lens group G4 are fixed with respect to an image plane, and a second lens group G2 and a third lens group G3 are moved along an optical axis.;COPYRIGHT: (C)2009,JPO&INPIT