| 摘要 |
A fast lens system is provided which includes a front lens group having a negative power, a diaphragm, and a rear lens group having a positive power, arranged in this order from a side of an object of the lens system. The lens system satisfies the following conditions:-0.5<f/f,<-0.2;(1)1.0< SIGMA dF+S/f<3.0; (2)ana1.5< SIGMA dR/f<3.0,(3)wherein f represents a focal length of the entire lens system, fF represents a focal length of the front lens group, SIGMA dF+S represents a sum of the thickness of the front lens group and the distance between the front lens group and the rear lens group, and SIGMA dR represents a thickness of the rear lens group.
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