| 摘要 |
A fast ultra-wide angle 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 to be photographed. The lens system satisfies the following conditions: -0.5<f/fF<-0.2; (1) 7.0< SIGMA dF+S/f<12.0; and (2) 5.0< SIGMA dR/f<10.0, (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 length of the front lens group and a distance between the front lens group and the rear lens group, and SIGMA dR represents a length of the rear lens group.
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