Short focal length optical system with large aperture

Claim 2

An optical system of short focal length and large effective aperture having substantially the following specification: ______________________________________ EFL = 8.26mm (.3253 inches) Half Angle of Field = 2.58° (Dimensions in Inches where applicable) Lens Radii Thickness Spacing N.sub.D V ______________________________________ R.sub.1 = .9100 L.sub.1 T.sub.1 = .0780 1.805 25.4 R.sub.2 = 52.8905 S.sub.1 = .0410 R.sub.3 = -.3670 L.sub.2 T.sub.2 = .1580 1.494 66.1 R.sub.4 = .4500 S.sub.2 = .3800 R.sub.5 = .5000 L.sub.3 T.sub.3 = .0910 1.494 66.1 R.sub.6 = .9966 S.sub.3 = .0030 R.sub.7 = .1780 L.sub.4 T.sub.4 = .1000 1.805 25.4 R.sub.8 = -.2170 S.sub.4 = .1000 R.sub.9 = Inf. L.sub.5 T.sub.5 = .0433 optical R.sub.10 = Inf. material S.sub.5 = .0050 ______________________________________ wherein the first column lists the lens elements numerically; the second column lists the respective radii of the elements, using the convention that convex surfaces have positive radii and concave surfaces have negative radii; the third column lists the respective thickness of the elements; the fourth column lists the axial spacings between adjacent elements; and the fifth and sixth columns list respectively the dispersion and refractive indices of the optical materials for the lens.

Claim 3

An optical system of short focal length and large effective aperture having substantially the following specification: ______________________________________ EFL = 8.26mm (.3251 inches) Half Angle of Field = 2.58° (Dimensions in Inches where applicable) Lens Radii Thickness Spacing N.sub.D V ______________________________________ L.sub.1 R.sub.1 = .9100 T.sub.1 = .0760 1.805 25.4 R.sub.2 = 52.8905 S.sub.1 = .0410 L.sub.2 R.sub.3 = - .3670 T.sub.2 = .1590 1.490 57.4 R.sub.4 = .4500 S.sub.2 = .3790 L.sub.3 R.sub.5 = .5000 T.sub.3 = .0920 1.494 66.1 R.sub.6 = .9966 S.sub.3 = .0030 L.sub.4 R.sub.7 = .1780 T.sub.4 = .1000 1.805 25.4 R.sub.8 = - .2170 S.sub.4 = .1000 L.sub.5 R.sub.9 = Inf. T.sub.5 = .0433 optical R.sub.10 = Inf. material S.sub.5 = .0049 ______________________________________ wherein the first column lists the lens elements numerically; the second column lists the respective radii of the elements, using the convention that convex surfaces have positive radii and concave surfaces have negative radii; the third column lists the respective thicknesses of the elements; the fourth column lists the axial spacings between adjacent elements; and the fifth and sixth columns list respectively the dispersion and refractive indices of the optical materials for the lens.

Claim 4

An optical system of short focal length and large effective aperture having substantially the following specification: ______________________________________ EFL = 8.26mm (.3251 inches) Half Angle of Field = 2.58° (Dimensions in Inches where applicable) Lens Radii Thickness Spacing N.sub.D V ______________________________________ L.sub.1 R.sub.1 = .9100 T.sub.1 = .0760 1.805 25.4 R.sub.2 = 52.8905 S.sub.1 = .0410 L.sub.2 R.sub.3 = - .3670 T.sub.2 = .1590 1.490 57.4 R.sub.4 = .4500 S.sub.2 = .3790 L.sub.3 R.sub.5 = .5000 T.sub.3 = .0920 1.494 66.1 R.sub.6 = .9966 S.sub.3 = .0030 L.sub.4 R.sub.7 = .1780 T.sub.4 = .1000 1.805 25.4 R.sub.8 = - .2170 S.sub.4 = .1000 L.sub.5 R.sub.9 = Inf. T.sub.5 = .0433 optical R.sub.10 = Inf. material S.sub.5 = .0049 ______________________________________ wherein the first column lists the lens elements numerically; the second column lists the respective radii of the elements, using the convention that convex surfaces have positive radii and concave surfaces have negative radii; the third column lists the respective thicknesses of the elements; the fourth column lists the axial spacings between adjacent elements; and the fifth and sixth columns list respectively the dispersion and refractive indices of the optical materials for the lens.

Claim 5

An optical system of short focal length and large effective aperture having substantially the following specification: ______________________________________ EFL = 8.26mm (.3251 inches) Half Angle of Field = 2.57° (Dimensions in Inches where applicable) Lens Radii Thickness Spacing N.sub.D V ______________________________________ L.sub.1 R.sub.1 = .9100 T.sub.1 = .0780 1.805 25.4 R.sub.2 = 52.8905 S.sub.1 = .0390 L.sub.2 R.sub.3 = - .3659 T.sub.2 = .1600 1.490 57.4 R.sub.4 = .4482 S.sub.2 = .3750 L.sub.3 R.sub.5 = .4925 T.sub.3 = .0950 1.490 57.4 R.sub.6 = .9966 S.sub.3 = .0030 L.sub.4 R.sub.7 = .1780 T.sub.4 = .0990 1.805 25.4 R.sub.8 = - .2170 S.sub.4 = .1010 L.sub.5 R.sub.9 = Inf. T.sub.5 = .0433 optical R.sub.10 = Inf. material S.sub.5 = .0046 ______________________________________ wherein the first column lists the lens elements numerically; the second column lists the respective radii of the elements, using the convention that convex surfaces have positive radii and concave surfaces have negative radii; the third column lists the respective thicknesses of the elements; the fourth column lists the axial spacings between adjacent elements; and the fifth and sixth columns list repsectively the dispersion and refractive indices of the optical materials for the lens.

Claim 6

An optical system of short focal length and large effective aperture having substantially the following specification: ______________________________________ EFL = 8.26mm (.3251 inches) Half Angle of Field = 2.57° (Dimensions in Inches where applicable) Lens Radii Thickness Spacing N.sub.D V ______________________________________ L.sub.1 R.sub.1 = .9100 T.sub.1 = .0780 1.805 25.4 R.sub.2 = 52.8905 S.sub.1 = .0390 L.sub.2 R.sub.3 = - .3659 T.sub.2 = .1600 1.490 57.4 R.sub.4 = .4482 S.sub.2 = .3750 L.sub.3 R.sub.5 = .4925 T.sub.3 = .0950 1.490 57.4 R.sub.6 = .9966 S.sub.3 = .0030 L.sub.4 R.sub.7 = .1780 T.sub.4 = .0990 1.805 25.4 R.sub.8 = - .2170 S.sub.4 = .1010 L.sub.5 R.sub.9 = Inf. T.sub.5 = .0433 optical R.sub.10 = Inf. material S.sub.5 = .0046 ______________________________________ wherein the first column lists the lens elements numerically; the second column lists the respective radii of the elements, using the convention that convex surfaces have positive radii and concave surfaces have negative radii; the third column lists the respective thicknesses of the elements; the fourth column lists the axial spacings between adjacent elements; and the fifth and sixth columns list repsectively the dispersion and refractive indices of the optical materials for the lens.