| 摘要 |
PROBLEM TO BE SOLVED: To provide a zoom lens for projection which can suppress aberrations satisfactorily while having a large magnification ratio (a zoom ratio of 1.4 times or more), has a half field angle larger than 35° at the wide angle end, and is suitable for enlarging and projecting an original image formed by light fluxes optically modulated by a minute device on a screen.SOLUTION: The zoom lens for projection includes, in order from the enlargement side, a first lens group G1 including at least four negative lenses and having a negative refractive power, a second lens group G2 having a positive refractive power, a third lens group G3 having a positive refractive power, and a fourth lens group G4 having a positive refractive power. |
