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US 3,942,875 AGranted
Wide aperture long focal length lens
AssigneePonder & Best, Inc.
InventorEllis I. Betensky
Life of this patent
Estimating the term…
Abstract
A wide aperture long focus photographic lens having internal aberration compensation and comprising an objective which is movable for focusing and a rear lens which is stationary with respect to the film plane and has an equivalent focal length which is substantially longer than the equivalent focal length of the overall lens.
Claims5
A lens defined substantially by the following data as scaled for a 24 .times. 36mm image frame:
- Lens Radius Axial Distance N.sub.d V.sub.d Between Surfaces ______________________________________ R.sub.1 = 44.903 L1 9.000 1.589 61.0 R.sub.2 = 1037.300 .250 R.sub.3 = 41.385 L2 14.284 1.516 64.0 R.sub.4 = 63.742 3.500 R.sub.5 = - 149.9080 L3 3.000 1.755 27.5 R.sub.6 = 31.213 19.599 R.sub.7 = 80.786 L4 5.777 1.750 35.0 R.sub.8 = - 47.302 4.543 R.sub.9 = -42.907 L5 2.700 1.755 27.5 R.sub.10 = -120.985 1.000 R.sub.11 = 119.884 L6 3.500 1.740 28.2 R.sub.12 = -71.346 2.436 R.sub.13 = - 61.984 L7 1.600 1.785 25.6 R.sub.14 = 166.988 40.5 ______________________________________
- where N.sub.d is the index of refraction, V.sub.d is the Abbe number, L1-L7 are the lens elements from the object end to the image end, R1-R14 are the surface radii of the lens elements, the axial distances are measured axially between lens surfaces, and the last axial distance is the back focal length.
A lens defined substantially by the following data as scaled for a 24 .times. 36mm image frame:
- Lens Radius Axial Distance N.sub.d V.sub.d Between Surfaces ______________________________________ R.sub.1 = 59.584 L1 13.120 1.713 53.9 R.sub.2 = 606.100 .100 R.sub.3 = 44.062 L2 5.901 1.805 25.4 R.sub.4 = 29.686 0 R.sub.5 29.686 L3 12.165 1.743 49.3 R.sub.6 = 50.109 3.800 R.sub.7 = -384.628 L4 2.478 1.720 29.3 R.sub.8 = 27.190 15.955 R.sub.9 = 79.129 L5 10.759 1.743 49.3 R.sub.10 = -25.062 0 R.sub.11 = -25.062 L6 3.500 1.640 60.2 R.sub.12 = - 209.527 .144 R.sub.13 = 156.254 L7 3.570 1.650 39.3 R.sub.14 = 34.143 0 R.sub.15 = 34.143 L8 7.989 1.532 49.0 R.sub.16 = -718.936 40.0 ______________________________________
- where N.sub.d is the index of refraction, V.sub.d is the Abbe number, L1-L8 are the lens elements from the object end to the image end, R1-R16 are the surface radii of the lens elements, the axial distance are measured axially between lens surfaces, and the last axial distance is the back focal length.
A lens defined substantially by the following data as scaled for a 24 .times. 36mm image frame:
- Axial Distance N.sub.d V.sub.d Lens Radius Between Surfaces ______________________________________ R.sub.1 = 46.7761 L1 9.000 1.58913 61.3 R.sub.2 = -1158.7859 0.250 R.sub.3 = 44.3752 L2 15.792 1.5168 64.2 R.sub.4 = 68.2001 3.500 R.sub.5 = -133.8090 L3 3.000 1.76182 26.2 R.sub.6 = 34.2235 19.215 R.sub.7 = 79.8431 L4 5.777 1.72342 38.0 R.sub.8 = -45.8030 3.341 R.sub.9 = -40.1509 L5 2.700 1.64769 33.8 R.sub.10 = -98.8379 1.000 R.sub.11 = -116.9509 L6 3.500 1.74077 27.8 R.sub.12 = -67.5594 2.869 R.sub.13 = -55.5673 L7 1.600 1.78472 25.7 R.sub.14 = 132.8154 40.497 ______________________________________
- where N.sub.d is the index if refraction, V.sub.d is the Abbe number, L1-L7 are the lens elements from the object end to the image end, R1-R14 are the surface radii of the lens elements, the axial distances are measured axially between lens surfaces, and the last axial distance is the back focal length.
A lens defined substantially by the following data as scaled for a 24 .times. 36mm image frame:
- Lens Radius Axial Distance N.sub.d V.sub.d Between Surfaces ______________________________________ R.sub.1 = 51.645 L1 14.100 1.60729 59.5 R.sub.2 = plano .369 R.sub.3 = 50.030 L2 11.841 1.5168 64.2 R.sub.4 = 100.33 5.017 R.sub.5 = - 233.12 L3 4.050 1.80518 25.5 R.sub.6 = 46.807 26.491 R.sub.7 = 126.394 L4 5.684 1.71736 29.5 R.sub.8 = -59.478 6.934 R.sub.9 = 037.419 L5 3.645 1.64769 33.8 R.sub.10 = -338.400 1.16 R.sub.11 = -144.915 L6 4.725 1.80518 25.5 R.sub.12 = -70.159 3.921 R.sub.13 = -70.863 L7 2.160 1.71736 20.5 R.sub.14 = -149.480 39.92 ______________________________________
- where N.sub.d is the index of refraction, V.sub.d is the Abbe number, L1-L7 are the lens elements from the object end to the image end, R1-R14 are the surface radii of the lens elements, the axial distances are measured axially between lens surfaces, and the last axial distance is the back focal length.
A lens defined substantially by the following data as scaled for a 24 .times. 36mm image frame:
- Lens Radius Axial Distance N.sub.d V.sub.d Between Surfaces ______________________________________ R.sub.1 = 85.85 L1 5.000 1.678 55.5 R.sub.2 = plano .234 R.sub.3 = 42.15 L2 14.847 1.678 55.5 R.sub.4 = 95.62 1.400 R.sub.5 = 406.87 L3 4.200 1.673 32.2 R.sub.6 = 28.95 12.635 R.sub.7 = - 28.07 L4 3.000 1.575 41.5 R.sub.8 = 74.74 L5 7.000 1.691 54.7 R.sub.9 = - 39.95 .234 R.sub.10 = 200.43 L6 3.605 1.678 55.5 R.sub.11 = - 84.63 0.3 R.sub.12 = -279.43 L7 15.192 1.517 64.2 R.sub.13 = - 61.78 7.954 R.sub.14 = - 48.45 L8 3.600 1.517 64.2 R.sub.15 = -176.73 40.50 ______________________________________
- where N.sub.d is the index of refraction, V.sub.d is the Abbe number, L1-L8 are the lens elememts from the object end to the image end, R1-R15 are the surface radii of the lens elements, the axial distances are measured axially between lens surfaces, and the last axial distance is the back focal length.
Dependencies are inferred from the claim text.