Seven-component microscope objective

A microscope objective having seven lenses aligned in sequence on an optical axis and that exits parallel light from the last element which comprises the following lens parameters, where radii (R), thicknesses (T) and spacing (S) are in millimeters and numbered sequentially from the object plane, a minus sign (-) denotes a radius having a center of curvature on the object side of the respective lens, and indices of refraction (ND) and Abbe numbers (.nu.) are absolute values

• ______________________________________ Thick- Refractive Abbe Radius ness Spacing Index Number Lens (R) (T) (S) (ND) (.nu.) ______________________________________ S.sub.1 =4.0 R.sub.1 =-8.000 I T.sub.1 =1.80 ND.sub.1 =1.564 .nu..sub.1 =60.80 R.sub.2 =-4.515 S.sub.2 =0.2 R.sub.3 =22.933 II T.sub.2 =1.20 ND.sub.2 =1.487 .nu..sub.2 =84.46 R.sub.4 =-14.370 S.sub.3 =0.2 R.sub.5 =-34.020 III T.sub.3 =1.60 ND.sub.3 =1.434 .nu..sub.3 =95.60 R.sub.6 =-10.140 S.sub.4 =0.2 R.sub.7 =11.230 T.sub.4 =2.20 ND.sub.4 =1.434 .nu..sub.4 =95.60 IV R.sub.8 =-8.671 T.sub.5 =0.70 ND.sub.5 =1.613 .nu..sub.5 =44.29 R.sub.9 =-55.748 S.sub.5 =0.2 R.sub.10 =6.290 T.sub.6 =3.50 ND.sub.6 =1.487 .nu..sub.6 =84.46 V R.sub.11 =-8.388 T.sub.7 =3.40 ND.sub.7 =1.673 .nu..sub.7 =32.20 R.sub.12 =2.639 S.sub.6 =1.6 R.sub.13 =-2.593 VI T.sub.8 =2.70 ND.sub.8 =1.54 .nu..sub.8 =45.75 R.sub.14 =-5.075 S.sub.7 =0.2 R.sub.15 =12.300 VII T.sub.9 =2.95 ND.sub.9 =1.487 .nu.=84.46 R.sub.16 =-20.060 ______________________________________