OPTICAL LENS

PURPOSE: To provide an optical lens capable of being easily changed over without necessitating the exchange by arranging the lens capable of changing the position or the attitude so as to match each of plural optical axis with the optical axis of the optical system. CONSTITUTION: An illumination lens 10 has an axis of rotation 0, a first optical axis z1 and a second optical axis z2 in two directions orthogonal to the axis of rotation 0. The lens 10 is used by arranging it for the illumination lenses 14 and 15 so that the optical axis z1 or z2 is matched with the optical axis Z of the optical system of a film scanner and the axis of rotation 0 is made parallel with the longitudinal direction X of a line sensor 11. The changeover of the lens is easily performed by rotating the lens by 90 deg. about the axis of rotation 0. Consequently, only by rotating the illumination lenses 14, 15 every time when the magnification of an image forming lens 12 is changed, the optimal illumination optical system corresponding to each image forming magnification is obtained and a film 13 is excellently illuminated.