356 2 142 1 428 0 928__________________________________________________________________________ d3 d9 a b 3 499 const in the above r1 r2 r3 are the curvature radii of the respective lens surfaces in the order from the object side d1 d2 d3 are the center thicknesses or air spaces of the repective lenses n1 n2 and u03bd1 u03bd2 are the refractive indices and the abbe numbers respectively of the respective lenses and ne ng and nc are the refractive indices for e line g line and c line respectively various aberrations in the present embodiment for the design standard magnification 1 10 are shown in fig2 a also aberrations for the magnifications 1 2 1 1 and 1 30 and during the photographing of an infinity object at infinity setting are shown in fig2 b 2c 2d and 2e in each of these figures to show the effect of the spacing correction according to the present invention the left hand side represents the case where the spacings are not corrected and the right hand side represents the case where the spacings are corrected from these figures it is seen that when the magnification is greater than the design standard magnification the symmetry of coma can be corrected very well without so much increasing astigmatism according to the correction of the spacings a and b it is also seen that when the magnification is smaller than the design standard magnification the symmetry of coma is well maintained a.