Front conversion lens system

摘要

The present invention provides a front conversion lens system attachable in front of an objective lens of a camera in which either of a real focal length photographing mode and a pseudo focal length photographing mode in which, an area, in an image recorded in a frame, smaller than a normal printing area printed when selecting the real focal length photographing mode is printed, is selectable, the lens system satisfying the following condition: 0.25 (f/ DF) (L-L')/L 7.0 wherein; f represents a focal length of a photographing lens system including the front conversion lens system and the objective lens; DF represents an axial thickness of the front conversion lens system; L represents a length of a diagonal line of an image plane to be printed when the real focal length photographing mode is selected; and L' represents a length of a diagonal line of an image plane to be printed when the pseudo focal length photographing mode is selected.