| 摘要 |
A zoom projection lens system includes a first lens group with negative refraction power and a second lens group with positive refraction power. The first lens group includes a first lens with negative refraction power. The second lens group includes a second lens with positive refraction power, a third lens with positive refraction power, a fourth lens with negative refraction power, and a fifth lens with positive refraction power. The zoom projection lens system satisfies the following formulas: 1.9<|F1/Fw|<2.1, 0.5<|f4/Fw|<0.8, 0.95<|f5/Fw|<1.2, where F1, f4 and f5 are respectively the effective focal lengths of the first lens group, the fourth lens and the fifth lens, Fw is the effective focal lengths of the zoom projection lens system in the wide angle state. |
