| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact zoom lens having longer back focus, set so that a pupil position on a reduction side is very far (telecentric) and having excellent optical performance. SOLUTION: This zoom lens is provided with a first negative lens group G1, a second positive lens group G2, a third negative lens group G3 and a fourth positive lens group G4 in order from an enlargement side. In the zoom lens, variable power is performed by moving the second and the third lens groups G2 and G3 in an optical axis direction. The zoom lens satisfies 1.3<Bfw/fw<3.2 when it is assumed that the air-converted back focus when focusing on infinity by the entire system of the zoom lens in a wide-angle end state is Bfw and the focal distance of the entire system of the zoom lens in the wide-angle end state is fw, respectively. |
