High numerical aperture intermediate wide angle objective

An intermediate wide angle retro focus objective lens system comprising a 7 group, 8 element lens wherein the lens elements have the following characteristics:

• Radius of Curvature Lens Spacing in m m in m m n.sub.i / .nu..sub.i ______________________________________ r .sub.1 175.400 d .sub.1 6.90 1.53172 / 48.9 r .sub.2 73.563 d .sub.2 9.42 r .sub.3 128.468 d .sub.3 3.00 1.54072 / 47.2 r .sub.4 56.023 d .sub.4 10.95 r .sub.5 168.280 d .sub.5 15.37 1.83400 / 37.2 r .sub.6 -3453.988 d .sub.6 8.27 r .sub.7 71.325 d .sub.7 23.82 1.79952 / 42.3 r .sub.8 -246.250 d .sub.8 9.05 r .sub.9 -195.000 d .sub.9 6.25 1.72825 / 28.5 r.sub.10 58.013 d.sub.10 10.25 r.sub.11 -176.700 d.sub.11 3.75 1.69895 / 30.1 r.sub.12 70.078 d.sub.12 18.85 1.78590 / 44.2 r.sub.13 -79.025 d.sub.13 0.25 r.sub.14 996.250 d.sub.14 18.80 1.65830 / 53.4 r.sub.15 -155.585 ______________________________________ F = 100.0 .vertline.F.sub.1.2 .vertline. = 103.37 F.sub.1.2.3.4 = 76.42. Seidel'3 Coefficients Lens Surface S.sub.1 S.sub.2 S.sub.3 S.sub.4 S.sub.5 ______________________________________ 1 0.042 0.052 0.063 0.198 0.321 2 -1.634 -0.162 -0.016 -0.472 -0.049 3 0.628 0.264 0.111 0.273 0.162 4 -7.842 0.147 -0.003 -0.627 0.012 5 2.577 0.686 0.183 0.270 0.121 6 -0.036 -0.082 -0.186 0.013 -0.393 7 -3.425 0.878 0.225 0.623 0.217 8 3.292 -1.920 1.119 0.181 -0.758 9 -3.040 1.651 -0.897 -0.216 0.604 10 -1.488 -1.040 -0.727 -0.727 -1.016 11 -0.000 0.000 -0.000 -0.233 0.699 12 0.433 0.258 0.154 0.041 0.116 13 2.211 -0.480 0.104 0.557 -0.144 14 -0.063 0.121 -0.233 0.040 0.373 15 1.834 -0.388 0.082 0.255 -0.071 SUM 0.339 -0.015 -0.020 0.177 0.194 ______________________________________
• Wherein the lenses are numbered from 1 to 8 from object side, and lenses 6 and 7 form doublets;
• and wherein
• F:
• is the resultant focal length of the whole optical system;
• F.sub.1.2....i :
• is the resultant focal length of the first to the i-th lenses;
• n.sub.i :
• is the d-line index of refraction of the i-th lens;
• .nu..sub.i :
• is the Abbe's number of the i-th lens;
• r.sub.k :
• is the radius of curvature of the k-th surface;
• and d.sub.j :
• is the j-th lens spacing or lens thickness.

An intermediate wide angle retro focus objective lens system comprising a 7 group, 8 element lens wherein the lens elements have the following characteristics:

• Radius of Curvature Lens Spacing in m m in m m n.sub.i / .nu..sub.i ______________________________________ r .sub.1 217.623 d .sub.1 6.17 1.49782 / 66.8 r .sub.2 69.596 d .sub.2 9.20 r .sub.3 234.650 d .sub.3 4.75 1.51454 / 54.7 r .sub.4 64.373 d .sub.4 12.02 r .sub.5 108.900 d .sub.5 23.57 1.83400 / 37.2 r .sub.6 -34888.149 d .sub.6 6.52 r .sub.7 91.838 d .sub.7 21.75 1.78800 / 47.5 r .sub.8 -269.731 d .sub.8 12.27 r .sub.9 -215.345 d .sub.9 5.00 1.84666 / 23.9 r.sub.10 57.528 d.sub.10 9.77 1.78800 / 47.5 r.sub.11 79.998 d.sub.11 13.67 r.sub.12 -87.823 d.sub.12 10.60 1.77250 / 49.6 r.sub.13 -62.057 d.sub.13 0.25 r.sub.14 182.638 d.sub.14 14.45 1.81600 / 46.8 r.sub.15 -229.152 ______________________________________ F = 100.0? .vertline.F.sub.1.2 .vertline. = 92.05? F.sub.1.2.3.4 = 85.04. Seidel's Coefficients Lens Surface S.sub.1 S.sub.2 S.sub.3 S.sub.4 S.sub.5 ______________________________________ 1 0.022 0.047 0.102 0.153 0.554 2 -2.087 -1.194 -0.683 -0.478 -0.664 3 0.324 0.383 0.452 0.145 0.705 4 -7.452 -3.837 -1.976 -0.528 -1.289 5 5.660 3.694 2.411 0.418 1.846 6 -0.005 -0.025 -0.125 0.001 -0.612 7 1.232 1.165 1.102 0.480 1.496 8 2.528 -0.212 0.018 0.163 -0.015 9 -2.383 0.094 -0.004 -0.213 0.009 10 -0.066 -0.074 -0.082 -0.031 -0.126 11 -0.630 -0.970 -1.496 -0.551 -3.155 12 -0.093 0.035 -0.014 -0.496 0.194 13 1.778 0.654 0.240 0.702 0.346 14 -0.002 -0.010 0.041 0.246 0.853 15 1.473 0.372 0.094 0.196 0.073 SUM 0.299 0.122 -0.000 0.208 0.217 ______________________________________
• Wherein the lenses are numbered from 1 to 8 from the object side, and lenses 6 and 7 form doublets;
• and wherein
• F:
• is the resultant focal length of the whole optical system;
• F.sub.1.2....i :
• is the resultant focal length of the first to the i-th lenses;
• n.sub.i :
• is the d-line index of refraction of the i-th lens;
• .nu..sub.i :
• is the Abbe's number of the i-th lens;
• r.sub.k :
• is the radius of curvature of the k-th surface;
• and d.sub.j :
• is the j-th lens spacing or lens thickness.