Four-member gauss objective

A four component six lens element Gauss type objective having an aperture ratio of at least 1:2.4 and a field angle of greater than 40.degree., comprising:

• a pair of inner, cemented doublet meniscus components concave toward and defining a central diaphragm space, each of said doublet components having planar bond surfaces and said doublet components having at least one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• a pair of outer components of positive power of refraction including a first single component positive meniscus concave toward the diaphragm space and being positioned ahead of said doublet components in the direction of light travel, said outer components having one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• wherein said lens consists essentially of the following design parameters:
• Focal length:
• f = 100
• Aperture ratio:
• 1:2
• Back focal length:
• s' = 59.71
• Field angle:
• .+-.22.5.degree.
• ______________________________________ Distance Surface to next Refractive Abbe- No. Radius surface Lens Index Number (i) (r.sub.i) (a.sub.i) No. (n.sub.e,i) .nu..sub.e,i) ______________________________________ 1 59.32 18.56 1 1.79227 47.15 2 147.94 0.38 1.0 -- 3 38.70 11.27 2 1.67133 41.64 4 .infin. 2.30 3 1.73430 28.19 5 26.03 10.07 1.0 -- 6 (diaphragm) 13.12 1.0 -- 7 -26.03 1.91 4 1.62408 36.11 8 .infin. 8.46 5 1.72055 47.69 9 -38.70 0.38 1.0 -- 10 -9525.05 6.38 6 1.72055 47.69 11 -59.32 -- 1.0 -- ______________________________________

A four component six lens element Gauss type objective having an aperture ratio of at least 1:2.4 and a field angle of greater than 40.degree., comprising:

• a pair of inner, cemented doublet meniscus components concave toward and defining a central diaphragm space, each of said doublet components having planar bond surfaces and said doublet components having at least one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• a pair of outer components of positive power of refraction including a first single component positive meniscus concave toward the diaphragm space and being positioned ahead of said doublet components in the direction of light travel, said outer components having one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• wherein said lens consists essentially of the following design parameters:
• Focal length:
• f = 100
• Aperture ratio:
• 1:2
• Back focal length:
• s' = 59.04
• Field angle:
• .+-.22.5.degree.
• ______________________________________ Distance Surface to next Refractive Abbe- No. Radius surface Lens Index Number (i) (r.sub.i) (a.sub.i) No. (n.sub.e,i) (.nu..sub.e,i) ______________________________________ 1 51.05 9.06 1 1.64128 55.15 2 190.84 0.38 1.0 -- 3 37.54 15.36 2 1.60889 43.63 4 .infin. 2.31 3 1.70444 29.84 5 23.67 9.16 1.0 -- 6 (diaphragm) 13.35 1.0 -- 7 -24.78 1.92 4 1.59911 38.91 8 .infin. 7.74 5 1.66152 50.59 9 -37.54 0.38 1.0 -- 10 767.77 6.73 6 1.64128 55.15 11 -51.05 -- 1.0 -- ______________________________________

A four component six lens element Gauss type objective having an aperture ratio of at least 1:2.4 and a field angle of greater than 40.degree., comprising:

• a pair of inner, cemented doublet meniscus components concave toward and defining a central diaphragm space, each of said doublet components having planar bond surfaces and said doublet components having at least one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• a pair of outer components of positive power of refraction including a first single component positive meniscus concave toward the diaphragm space and being positioned ahead of said doublet components in the direction of light travel, said outer components having one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• wherein said lens consists essentially of the following design parameters:
• Focal length:
• f = 100
• Aperture ratio:
• 1:2
• Back focal length:
• s' = 60.03
• Field angle:
• .+-.22.5.degree.
• ______________________________________ Distance Surface to next Refractive Abbe- No. Radius surface Lens Index Number (i) (r.sub.i) (a.sub.i) No. (n.sub.e,i) (.nu..sub.e,i) ______________________________________ 1 54.30 11.38 1 1.74795 44.49 2 149.79 0.39 1.0 -- 3 37.69 12.59 2 1.67133 41.64 4 .infin. 2.31 3 1.73430 28.19 5 24.56 10.91 1.0 -- 6 (diaphragm) 13.78 1.0 -- 7 -25.95 1.93 4 1.63003 35.45 8 .infin. 6.97 5 1.72055 47.69 9 -37.69 0.39 1.0 -- 10 -636.72 8.66 6 1.72055 47.69 11 -54.30 -- 1.0 -- ______________________________________

A four component six lens element Gauss type objective having an aperture ratio of at least 1:2.4 and a field angle of greater than 40.degree., comprising:

• a pair of inner, cemented doublet meniscus components concave toward and defining a central diaphragm space, each of said doublet components having planar bond surfaces and said doublet components having at least one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• a pair of outer components of positive power of refraction including a first single component positive meniscus concave toward the diaphragm space and being positioned ahead of said doublet components in the direction of light travel, said outer components having one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• wherein said lens consists essentially of the following design parameters:
• Focal length:
• f = 100
• Aperture ratio:
• 1:2
• Back focal length:
• s' = 71.20
• Field angle:
• .+-.22.5.degree.
• ______________________________________ Distance Surface to next Refractive Abbe- No. Radius surface Lens Index Number (i) (r.sub.i) (a.sub.i) No. (n.sub.e,i) (.nu..sub.e,i) ______________________________________ 1 84.34 7.76 1 1.76166 27.37 2 298.43 0.38 1.0 -- 3 38.93 13.61 2 1.70587 40.75 4 .infin. 1.94 3 1.79190 25.55 5 28.59 10.54 1.0 -- 6 (diaphragm) 15.07 1.0 -- 7 -28.59 1.91 4 1.65284 33.59 8 .infin. 9.48 5 1.79227 47.15 9 -38.93 0.38 1.0 -- 10 .infin. 7.40 6 1.79227 47.15 11 -84.34 -- 1.0 -- ______________________________________

A four component six lens element Gauss type objective having an aperture ratio of at least 1:2.4 and a field angle of greater than 40.degree., comprising:

• a pair of inner, cemented doublet meniscus components concave toward and defining a central diaphragm space, each of said doublet components having planar bond surfaces and said doublet components having at least one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• a pair of outer components of positive power of refraction including a first single component positive meniscus concave toward the diaphragm space and being positioned ahead of said doublet components in the direction of light travel, said outer components having one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• wherein said lens consists essentially of the following design parameters:
• Focal length:
• f = 100
• Aperture ratio:
• 1:2
• Back focal length:
• s' = 61.84
• Field angle:
• .+-.22.5.degree.
• ______________________________________ Distance Surface to next Refractive Abbe- No. Radius surface Lens Index Number (i) (r.sub.i) (a.sub.i) No. (n.sub.e,i) (.nu..sub.e,i) ______________________________________ 1 50.16 7.35 1 1.66152 50.59 2 186.96 0.38 1.0 -- 3 37.35 14.33 2 1.60889 43.63 4 .infin. 2.31 3 1.70444 29.84 5 23.33 9.90 1.0 -- 6 (diaphragm) 13.12 1.0 -- 7 -25.18 1.92 4 1.59911 38.91 8 .infin. 8.00 5 1.66152 50.59 9 -37.35 0.38 1.0 -- 10 .infin. 6.73 6 1.64128 55.15 11 -50.16 -- 1.0 -- ______________________________________

A four component six lens element Gauss type objective having an aperture ratio of at least 1:2.4 and a field angle of greater than 40.degree., comprising:

• a pair of inner, cemented doublet meniscus components concave toward and defining a central diaphragm space, each of said doublet components having planar bond surfaces and said doublet components having at least one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• a pair of outer components of positive power of refraction including a first single component positive meniscus concave toward the diaphragm space and being positioned ahead of said doublet components in the direction of light travel, said outer components having one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• wherein said lens consists essentially of the following design parameters:
• Focal length:
• f = 100
• Aperture ratio:
• 1:2
• Back focal length:
• s' = 57.59
• Field angle:
• .+-.22.5.degree.
• ______________________________________ Distance Surface to next Refractive Abbe- No. Radius surface Lens Index Number (i) (r.sub.i) (a.sub.i) No. (n.sub.e,i) (.nu..sub.e,i) ______________________________________ 1 57.94 9.42 1 1.79227 47.15 2 190.48 0.38 1.0 -- 3 40.31 14.67 2 1.62987 38.68 4 .infin. 3.38 3 1.76859 26.31 5 25.75 10.33 1.0 -- 6 (diaphragm) 13.81 1.0 -- 7 -27.28 1.92 4 1.63003 35.45 8 .infin. 6.73 5 1.74759 44.49 9 -40.31 0.38 1.0 -- 10 .infin. 7.94 6 1.72055 47.69 11 -57.94 -- 1.0 -- ______________________________________

A four component six lens element Gauss type objective having an aperture ratio of at least 1:2.4 and a field angle of greater than 40.degree., comprising:

• a pair of inner, cemented doublet meniscus components concave toward and defining a central diaphragm space, each of said doublet components having planar bond surfaces and said doublet components having at least one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• a pair of outer components of positive power of refraction including a first single component positive meniscus concave toward the diaphragm space and being positioned ahead of said doublet components in the direction of light travel, said outer components having one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• wherein said lens consists essentially of the following design parameters:
• Focal length:
• f = 100
• Aperture ratio:
• 1:2
• Back focal length:
• s' = 71.77
• Field angle:
• .+-.22.5.degree.
• ______________________________________ Distance Surface to next Refractive Abbe- No. Radius surface Lens Index Number (i) (r.sub.i) (a.sub.i) No. (n.sub.e,i) (.nu..sub.e,i) ______________________________________ 1 82.13 7.67 1 1.73430 28.19 2 375.73 0.38 1.0 -- 3 39.43 13.80 2 1.67133 41.64 4 .infin. 2.49 3 1.79190 25.55 5 28.74 12.08 1.0 -- 6 (diaphragm) 12.84 1.0 -- 7 -28.74 1.92 4 1.65222 33.60 8 .infin. 10.03 5 1.79227 47.15 9 -39.43 0.38 1.0 -- 10 .infin. 7.09 6 1.79227 47.15 11 -82.13 -- 1.0 -- ______________________________________

A four component six lens element Gauss type objective having an aperture ratio of at least 1:2.4 and a field angle of greater than 40.degree., comprising:

• a pair of inner, cemented doublet meniscus components concave toward and defining a central diaphragm space, each of said doublet components having planar bond surfaces and said doublet components having at least one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• a pair of outer components of positive power of refraction including a first single component positive meniscus concave toward the diaphragm space and being positioned ahead of said doublet components in the direction of light travel, said outer components having one spherical surface each, which are of the same radius of curvature and which are arranged symmetrically with respect to the location of the diaphragm;
• and
• wherein said lens consists essentially of the following design parameters:
• Focal length:
• f = 100
• Aperture ratio:
• 1:2
• Back focal length:
• s' = 58.88
• Field angle:
• .+-.22.5.degree.
• ______________________________________ Distance Surface to next Refractive Abbe- No. Radius surface Lens Index Number (i) (r.sub.i) (a.sub.i) No. (n.sub.e,i) (.nu..sub.e,i) ______________________________________ 1 59.94 9.57 1 1.79227 47.15 2 167.31 0.38 1.0 -- 3 40.30 14.35 2 1.67133 41.64 4 .infin. 2.87 3 1.73430 28.19 5 25.67 10.81 1.0 -- 6 (diaphragm) 13.39 1.0 -- 7 -27.69 1.91 4 1.63003 35.45 8 .infin. 7.65 5 1.72055 47.69 9 -40.30 0.38 1.0 -- 10 .infin. 8.61 6 1.72055 47.69 11 -59.94 -- 1.0 -- ______________________________________