| 摘要 |
PURPOSE:To efficiently obtain soft focusing effect and to simplify the structure of a lens barrel by specifying the constitution of lenses and moving a part of lens groups in normal photographing without arranging specific lens group. CONSTITUTION:The titled system is constituted of the 1st lens group I having positive refractive force, the 2nd lens group II turning its convex surface to the object side and having a meniscus-like lens, an aperture diaphragm, and the 3rd lens group which are arranged successively from the object side and the soft effect is generated by moving the 2nd lens group on the optical axis. Thus, the soft effect is obtained by moving a part of lens groups in the normal photographing without arranging a specific lens group to obtain the soft effect and the structure of the lens barrel is prevented from being complexed by independently arranging the lens group for focusing and the one to obtain the soft effect.
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