| 摘要 |
PURPOSE:To enable satisfactory photographing without deteriorating an image even if a flange back is made substantially long by correcting satisfactorily a comatic aberration and spherical aberration while maintaining the image flat by decreasing the curvature of field. CONSTITUTION:A titled lens is constituted of a correction plate 1 of which the exit side is constituted of a quartic aspherical face, a main reflection mirror 2 which has a reflection surface of a quartic aspherical face, an auxiliary reflection mirror 3 which is diagonally provided between the plate 1 and the mirror 2 to conduct the light reflected from the mirror 2 to a lateral imaging plane and a positive lens system 5 which is disposed between the mirror 3 and the plane 4. Said lens satisfies the equations 1-3. The condition 1 is required to correct satisfactorily the curvature of field by regulating the Petzval sum P of the entire system, and e2, e3 are the coefft. of the quartic aspherical faces of the correction plate and main reflection mirrors of a Light Schmidt camera and E2, E3 are those of lens of this invention. |
