Optical relay system

Claim 2

An eight element lens system, comprising in combination: an A element being double convex having radius of curvatures of R21 and R22 and an index of refraction Na, a B element being a negative meniscus having radius of curvatures of R23 and R24 and an index of refraction Nb, a C element being double convex having radius of curvatures of R25 and R26 and an index of refraction Nc, a D element being double concave having radius of curvatures of R27 and R28 and an index of refraction N3, an E element being double concave having radius of curvatures of R29 and R30 and an index of refraction Ne, an F element being double convex having radius of curvatures of R31 and R32 and an index of refraction Nf, a G element being a negative meniscus having radius of curvatures of R33 and R34 and an index of refraction Ng, an H element being double convex having radius of curvatures of R35 and R36 and an index of refraction Nh, wherein said radii and said indices of refraction are substantially:

Claim 3

An eight element lens system as set forth in claim 1 wherein said A to H lens elements have Abbe numbers Nu 1 to Nu h, respectively, wherein: 58 < or = Nu a < or = 63 43 < or = Nu b < or = 46 58 < or = Nu c < or = 63 42 < or = Nu d < or = 46 42 < or = Nu e < or = 46 58 < or = Nu f < or = 63 42 < or = Nu g < or = 46 58 < or = Nu h < or = 63

Claim 4

An eight element lens system as set forth in claim 2 wherein: said B element is in contact with said A element, said C element is spaced from said B element by an axial spacing Sb, said D element is in contact with said C element, said E element is spaced from said D element by an axial spacing Sd, said F element is in contact with said E element, said G element is spaced from said F element by an axial spacing Sf, and said H element is in contact with said G element wherein: 0.0008 fl. < or = Sb < or = 0.06 fl. 0.08 fl. < or = Sd < or = 0.18 fl. 0.0008 fl. < or = Sf < or = 0.0025 fl.

Claim 5

An eight element lens system as set forth in claim 3, wherein said A to H lens elements have axial thickness ta to th, respectively, wherein: 0.08 fl. < or = ta, tb, tc, td, te, tf, tg, th < or = 0.12 fl.

Claim 6

An eight element lens system, comprising in combination: an A element being double convex having an axial thickness ta, radius of curvatures of R21 and R22, an index of refraction Na and an Abbe number Nu a; a B element being a negative meniscus having an axial thickness tb, radius of curvatures of R23 and R24, said B element being in contact with said A element, an index of refraction Nb, and an Abbe number Nu b; a C element being double convex having an axial thickness of tc, radius of curvatures of R25 and R26, said C element being spaced from said B element by an axial spacing Sb, an index of refraction Nc, and an Abbe number Nu c; a D element being double concave having an axial thickness of td, radius of curvatures of R27 and R28, said D element being in contact with said C element, an index of refraction Nd and an Abbe number Nu d; an E element being double concave having an axial thickness te, radius of curvatures of R29 and R30, said E element being spaced from said D element by an axial spacing Sd, an index of refraction Ne and an Abbe number Nu e; an F element being double convex having an axial thickness tf, radius of curvatures of R31 and R32, said F element being in contact with said E element, an index of refraction Nf and an Abbe number Nu f; a G element being a negative meniscus having an axial thickness tg, radius of curvatures of R33 and R34, said G element being spaced from said F element by an axial spacing Sf, an index of refraction Ng and an Abbe number Nu g; an H element being double convex having an axial thickness of Sh, radius of curvatures R35 and R36, said H element being in contact with said G element, an index of refraction Nh and an Abbe number Nu h; wherein said thicknesses, spacings, radii, indices of refraction, and Abbe numbers are substantially: R21 0.81 fl. ta 0.1 fl. R22 0.68 fl. tb 0.1 fl. R23 -0.68 fl. tc 0.1 fl. R24 2.0 fl. td 0.1 fl. R25 0.47 fl. te 0.1 fl. R26 2.10 fl. tf 0.1 fl. R27 -2.10 fl. tg 0.1 fl. R28 -0.3 fl. th 0.1 fl. R29 -0.33 fl. R30 -0.95 fl. R31 0.95 fl. Sb 0.002 fl. R32 0.55 fl. Sd 0.15 fl. R33 1.02 fl. Sf 0.002 fl. R34 -0.46 fl. R35 0.46 fl. R36 0.84 fl. Na 1.59 Nu a 60 Nb 1.61 Nu b 44 Nc 1.59 Nu c60 Nd 1.61 Nu d 44 Ne 1.61 Nu e 44 Nf 1.59 Nu f 60 Ng 1.61 Nu g 44 Nh 1.59 Nu h 60 where fl. is the focal length of the lens system.

Claim 7

An eight element lens system, comprising in combination: an A element being double convex having an axial thickness ta, radius of curvatures of R21 and R22, an index of refraction Na and an Abbe number Nu a; a B element being a negative meniscus having an axial thickness tb, radius of curvatures of R23 and R24, said B element being in contact with said A element, an index of refraction Nb, and an Abbe number Nu b; a C element being double convex having an axial thickness of tc, radius of curvatures of R25 and R26, said C element being spaced from said B element by an axial spacing Sb, an index of refraction Nc, and an Abbe number Nu c; a D element being double concave having an axial thickness of td, radius of curvatures of R27 and R28, said D element being in contact with said C element, an index of refraction Nd and an Abbe number Nu d; an E element being double concave having an axial thickness te, radius of curvatures of R29 and R30, said E element being spaced from said D element by an axial spacing Sd, an index of refraction Ne and an Abbe number Nu e; an F element being double convex having an axial thickness tf, radius of curvatures of R31 and R32, said F element being in contact with said E element, an index of refraction Nf and an Abbe number Nu f; a G element being a negative meniscus having an axial thickness tg, radius of curvatures of R33 and R34, said G element being spaced from said F element by an axial spacing Sf, an index of refraction Ng and an Abbe number Nu g; an H element being double convex having an axial thickness of Sh, radius of curvatures R35 and R36, said H element being in contact with said G element, an index of refraction Nh and an Abbe number Nu h; wherein said thicknesses, spacings, radii, indices of refraction, and Abbe numbers are substantially: R21 0.81 fl. ta 0.1 fl. R22 0.68 fl. tb 0.1 fl. R23 -0.68 fl. tc 0.1 fl. R24 2.0 fl. td 0.1 fl. R25 0.47 fl. te 0.1 fl. R26 2.10 fl. tf 0.1 fl. R27 -2.10 fl. tg 0.1 fl. R28 -0.3 fl. th 0.1 fl. R29 -0.33 fl. R30 -0.95 fl. R31 0.95 fl. Sb 0.002 fl. R32 0.55 fl. Sd 0.15 fl. R33 1.02 fl. Sf 0.002 fl. R34 -0.46 fl. R35 0.46 fl. R36 0.84 fl. Na 1.59 Nu a 60 Nb 1.61 Nu b 44 Nc 1.59 Nu c60 Nd 1.61 Nu d 44 Ne 1.61 Nu e 44 Nf 1.59 Nu f 60 Ng 1.61 Nu g 44 Nh 1.59 Nu h 60 where fl. is the focal length of the lens system.

Claim 8

An eight element lens system, comprising in combination: an A element being double convex having an axial thickness ta, radius of curvatures of R21 and R22, an index of refraction Na and an Abbe number Nu a; a B element being a negative meniscus having an axial thickness tb, radius of curvatures of R23 and R24, said B element being in contact with said A element, an index of refraction Nb, and an Abbe number Nu b; a C element being double convex having an axial thickness of tc, radius of curvatures of R25 and R26, said C element being spaced from said B element by an axial spacing Sb, an index of refraction Nc, and an Abbe number Nu c; a D element being double concave having an axial thickness of td, radius of curvatures of R27 and R28, said D element being in contact with said C element, an index of refraction Nd and an Abbe number Nu d; an E element being double concave having an axial thickness te, radius of curvatures of R29 and R30, said E element being spaced from said D element by an axial spacing Sd, an index of refraction Ne and Abbe number Nu e; an F element being double convex having an axial thickness tf, radius of curvatures of R31 and R32, said F element being in contact with said E element, an index of refraction Nf and an Abbe number Nu f; a G element being a negative meniscus having an axial thickness tg, radius of curvatures of R33 and R34, said G element being spaced from said F element by an axial spacing Sf, an index of refraction Ng and an Abbe number Nu g; an H element being double convex having an axial thickness of Sh, radius of curvatures R35 and R36, said H element being in contact with said G element, an index of refraction Nh and an Abbe number Nu h; wherein said thicknesses, spacings, radii, indicies of refraction, and Abbe numbers are substantially: R21 0.72 fl. ta 0.1 fl. R22 1.15 fl. tb 0.09 fl. R23 -1.15 fl. tc 0.1 fl. R24 2.62 fl. td 0.09 fl. R25 0.46 fl. te 0.09 fl. R26 2.0 fl. tf 0.1 fl. R27 -2.0 fl. tg 0.09 fl. R28 -0.29 fl. th 0.1 fl. R29 -0.32 fl. R30 -0.52 fl. R31 0.52 fl. Sb 0.02 fl. R32 0.54 fl. Sd 0.14 fl. R33 0.93 fl. Sf 0.001 fl. R34 -0.46 fl. R35 0.46 fl. R36 0.84 fl. Na 1.59 Nu a 60 Nb 1.61 Nu b 44 Nc 1.59 Nu c 60 Nd 1.61 Nu d 44 Ne 1.61 Nu e 44 Nf 1.59 Nu f 60 Ng 1.61 Nu g 44 Nh 1.59 Nu h 60 where fl. is the focal length of the lens system.

Claim 9

An eight element lens system, comprising in combination: an A element being double convex having an axial thickness ta, radius of curvatures of R21 and R22, an index of refraction Na and an Abbe number Nu a; a B element being a negative meniscus having an axial thickness tb, radius of curvatures of R23 and R24, said B element being in contact with said A element, an index of refraction Nb, and an Abbe number Nu b; a C element being double convex having an axial thickness of tc, radius of curvatures of R25 and R26, said C element being spaced from said B element by an axial spacing Sb, an index of refraction Nc, and an Abbe number Nu c; a D element being double concave having an axial thickness of td, radius of curvatures of R27 and R28, said D element being in contact with said C element, an index of refraction Nd and an Abbe number Nu d; an E element being double concave having an axial thickness te, radius of curvatures of R29 and R30, said E element being spaced from said D element by an axial spacing Sd, an index of refraction Ne and Abbe number Nu e; an F element being double convex having an axial thickness tf, radius of curvatures of R31 and R32, said F element being in contact with said E element, an index of refraction Nf and an Abbe number Nu f; a G element being a negative meniscus having an axial thickness tg, radius of curvatures of R33 and R34, said G element being spaced from said F element by an axial spacing Sf, an index of refraction Ng and an Abbe number Nu g; an H element being double convex having an axial thickness of Sh, radius of curvatures R35 and R36, said H element being in contact with said G element, an index of refraction Nh and an Abbe number Nu h; wherein said thicknesses, spacings, radii, indicies of refraction, and Abbe numbers are substantially: R21 0.72 fl. ta 0.1 fl. R22 1.15 fl. tb 0.09 fl. R23 -1.15 fl. tc 0.1 fl. R24 2.62 fl. td 0.09 fl. R25 0.46 fl. te 0.09 fl. R26 2.0 fl. tf 0.1 fl. R27 -2.0 fl. tg 0.09 fl. R28 -0.29 fl. th 0.1 fl. R29 -0.32 fl. R30 -0.52 fl. R31 0.52 fl. Sb 0.02 fl. R32 0.54 fl. Sd 0.14 fl. R33 0.93 fl. Sf 0.001 fl. R34 -0.46 fl. R35 0.46 fl. R36 0.84 fl. Na 1.59 Nu a 60 Nb 1.61 Nu b 44 Nc 1.59 Nu c 60 Nd 1.61 Nu d 44 Ne 1.61 Nu e 44 Nf 1.59 Nu f 60 Ng 1.61 Nu g 44 Nh 1.59 Nu h 60 where fl. is the focal length of the lens system.

Claim 10

An eight element lens system, comprising in combination: an A element being double convex having an axial thickness ta, radius of curvatures of R21 and R22, an index of refraction Na and an Abbe number Nu a; a B element being a negative meniscus having an axial thickness tb, radius of curvatures of R23 and R24, said B element being in contact with said A element, an index of refraction Nb, and an Abbe number Nu b; a C element being double convex having an axial thickness of tc, radius of curvatures of R25 and R26, said C element being spaced from said B element by an axial spacing Sb, an index of refraction Nc, and an Abbe number Nu c; a D element being double concave having an axial thickness of td, radius of curvatures of R27 and R28, said D element being in contact with said C element, an index of refraction Nd and an Abbe number Nu d; an E element being double concave having an axial thickness te, radius of curvatures of R29 and R30, said E element being spaced from said D element by an axial spacing Sd, an index of refraction Ne and an Abbe number Nu e; an F element being double convex having an axial thickness tf, radius of curvatures of R31 and R32, said F element being in contact with said E element, an index of refraction Nf and an Abbe number Nu f; a G element being a negative meniscus having an axial thickness tg, radius of curvatures of R33 and R34, said G element being spaced from said F element by an axial spacing Sf, an index of refraction Ng and an Abbe number Nu g; an H element being double convex having an axial thickness of Sh, radius of curvatures R35 and R36, said H element being in contact with said G element, an index of refraction Nh and an Abbe number Nu h; wherein said thicknesses, spacings, radii, indicies of refraction and Abbe numbers are substantially: R21 0.77 fl. ta 0.1 fl. R22 0.88 fl. tb 0.09 fl. R23 -0.88 fl. tc 0.09 fl. R24 2.20 fl. td 0.09 fl. R25 0.44 fl. te 0.09 fl. R26 4.34 fl. tf 0.1 fl. R27 -4.34 fl. tg 0.09 fl. R28 -0.28 fl. th 0.1 fl. R29 -0.31 fl. R30 -0.82 fl. R31 0.82 fl. Sb 0.001 fl. R32 0.56 fl. Sd 0.14 fl. R33 1.11 fl. Sf 0.001 fl. R34 -0.40 fl. R35 0.40 fl. R36 0.70 fl. Na 1.59 Nu a 60 Nb 1.61 Nu b 44 Nc 1.59 Nu c 60 Nd 1.61 Nu d 44 Ne 1.61 Nu e 44 Nf 1.59 Nu f 60 Ng 1.61 Nu g 44 Nh 1.59 Nu h 60 where fl. is the focal length of the lens system.

Claim 11

An eight element lens system, comprising in combination: an A element being double convex having an axial thickness ta, radius of curvatures of R21 and R22, an index of refraction Na and an Abbe number Nu a; a B element being a negative meniscus having an axial thickness tb, radius of curvatures of R23 and R24, said B element being in contact with said A element, an index of refraction Nb, and an Abbe number Nu b; a C element being double convex having an axial thickness of tc, radius of curvatures of R25 and R26, said C element being spaced from said B element by an axial spacing Sb, an index of refraction Nc, and an Abbe number Nu c; a D element being double concave having an axial thickness of td, radius of curvatures of R27 and R28, said D element being in contact with said C element, an index of refraction Nd and an Abbe number Nu d; an E element being double concave having an axial thickness te, radius of curvatures of R29 and R30, said E element being spaced from said D element by an axial spacing Sd, an index of refraction Ne and an Abbe number Nu e; an F element being double convex having an axial thickness tf, radius of curvatures of R31 and R32, said F element being in contact with said E element, an index of refraction Nf and an Abbe number Nu f; a G element being a negative meniscus having an axial thickness tg, radius of curvatures of R33 and R34, said G element being spaced from said F element by an axial spacing Sf, an index of refraction Ng and an Abbe number Nu g; an H element being double convex having an axial thickness of Sh, radius of curvatures R35 and R36, said H element being in contact with said G element, an index of refraction Nh and an Abbe number Nu h; wherein said thicknesses, spacings, radii, indicies of refraction and Abbe numbers are substantially: R21 0.77 fl. ta 0.1 fl. R22 0.88 fl. tb 0.09 fl. R23 -0.88 fl. tc 0.09 fl. R24 2.20 fl. td 0.09 fl. R25 0.44 fl. te 0.09 fl. R26 4.34 fl. tf 0.1 fl. R27 -4.34 fl. tg 0.09 fl. R28 -0.28 fl. th 0.1 fl. R29 -0.31 fl. R30 -0.82 fl. R31 0.82 fl. Sb 0.001 fl. R32 0.56 fl. Sd 0.14 fl. R33 1.11 fl. Sf 0.001 fl. R34 -0.40 fl. R35 0.40 fl. R36 0.70 fl. Na 1.59 Nu a 60 Nb 1.61 Nu b 44 Nc 1.59 Nu c 60 Nd 1.61 Nu d 44 Ne 1.61 Nu e 44 Nf 1.59 Nu f 60 Ng 1.61 Nu g 44 Nh 1.59 Nu h 60 where fl. is the focal length of the lens system.

Claim 12

An eight element lens system, comprising in combination: an A element being double convex having an axial thickness ta, radius of curvatures of R21 and R22, an index of refraction Na and an Abbe number Nu a; a B element being a negative meniscus having an axial thickness tb, radius of curvatures of R23 and R24, said B element being in contact with said A element, an index of refraction Nb, and an Abbe number Nu b; a C element being double convex having an axial thickness of tc, radius of curvatures of R25 and R26, said C element being spaced from said B element by an axial spacing Sb, an index of refraction Nc, and an Abbe number Nu c; a D element being double concave having an axial thickness of td, radius of curvatures of R27 and R28, said D element being in contact with said C element, an index of refraction Nd and an Abbe number Nu d; an E element being double concave having an axial thickness te, radius of curvatures of R29 and R30, said E element being spaced from said D element by an axial spacing Sd, an index of refraction Ne and an Abbe number Nu e; an F element being double convex having an axial thickness tf, radius of curvatures of R31 and R32, said F element being in contact with said E element, an index of refraction Nf and an Abbe number Nu f; a G element being a negative meniscus having an axial thickness tg, radius of curvatures of R33 and R34, said G element being spaced from said F element by an axial spacing Sf, an index of refraction Ng and an Abbe number Nu g; an H element being double convex having an axial thickness of Sh, radius of curvatures R35 and R36, said H element being in contact with said G element, an index of refraction Nh, and an Abbe number Nu h; wherein said thicknesses, spacings, radii, indicies of refraction, and Abbe numbers are substantially: R21 0.68 fl. ta 0.1 fl. R22 1.13 fl. tb 0.09 fl. R23 -1.13 fl. tc 0.08 fl. R24 3.11 fl. td 0.09 fl. R25 0.47 fl. te 0.09 fl. R26 2.55 fl. tf 0.1 fl. R27 -2.55 fl. tg 0.09 fl. R28 -0.28 fl. th 0.1 fl. R29 -0.30 fl. R30 -0.51 fl. R31 0.51 fl. Sb 0.05 fl. R32 0.52 fl. Sd 0.1 fl. R33 0.90 fl. Sf 0.001 fl. R34 -0.46 fl. R35 0.46 fl. R36 0.84 fl. Na 1.59 Nu a 60 Nb 1.61 Nu b 44 Nc 1.59 Nu c 60 Nd 1.61 Nu d 44 Ne 1.61 Nu e 44 Nf 1.59 Nu f 60 Ng 1.61 Nu g 44 Nh 1.59 Nu h 60 where fl. is the focal length of the lens system.

Claim 13

An eight element lens system, comprising in combination: an A element being double convex having an axial thickness ta, radius of curvatures of R21 and R22, an index of refraction Na and an Abbe number Nu a; a B element being a negative meniscus having an axial thickness tb, radius of curvatures of R23 and R24, said B element being in contact with said A element, an index of refraction Nb, and an Abbe number Nu b; a C element being double convex having an axial thickness of tc, radius of curvatures of R25 and R26, said C element being spaced from said B element by an axial spacing Sb, an index of refraction Nc, and an Abbe number Nu c; a D element being double concave having an axial thickness of td, radius of curvatures of R27 and R28, said D element being in contact with said C element, an index of refraction Nd and an Abbe number Nu d; an E element being double concave having an axial thickness te, radius of curvatures of R29 and R30, said E element being spaced from said D element by an axial spacing Sd, an index of refraction Ne and an Abbe number Nu e; an F element being double convex having an axial thickness tf, radius of curvatures of R31 and R32, said F element being in contact with said E element, an index of refraction Nf and an Abbe number Nu f; a G element being a negative meniscus having an axial thickness tg, radius of curvatures of R33 and R34, said G element being spaced from said F element by an axial spacing Sf, an index of refraction Ng and an Abbe number Nu g; an H element being double convex having an axial thickness of Sh, radius of curvatures R35 and R36, said H element being in contact with said G element, an index of refraction Nh, and an Abbe number Nu h; wherein said thicknesses, spacings, radii, indicies of refraction, and Abbe numbers are substantially: R21 0.68 fl. ta 0.1 fl. R22 1.13 fl. tb 0.09 fl. R23 -1.13 fl. tc 0.08 fl. R24 3.11 fl. td 0.09 fl. R25 0.47 fl. te 0.09 fl. R26 2.55 fl. tf 0.1 fl. R27 -2.55 fl. tg 0.09 fl. R28 -0.28 fl. th 0.1 fl. R29 -0.30 fl. R30 -0.51 fl. R31 0.51 fl. Sb 0.05 fl. R32 0.52 fl. Sd 0.1 fl. R33 0.90 fl. Sf 0.001 fl. R34 -0.46 fl. R35 0.46 fl. R36 0.84 fl. Na 1.59 Nu a 60 Nb 1.61 Nu b 44 Nc 1.59 Nu c 60 Nd 1.61 Nu d 44 Ne 1.61 Nu e 44 Nf 1.59 Nu f 60 Ng 1.61 Nu g 44 Nh 1.59 Nu h 60 where fl. is the focal length of the lens system.

Claim 14

An eight element lens system, comprising in combination: an A element being double convex having an axial thickness ta, radius of curvatures of R21 and R22, an index of refraction Na, and an Abbe number Nu a; a B element being a negative meniscus having an axial thickness tb, radius of curvatures of R23 and R24, said B element being in contact with said A element, an index of refraction Nb and an Abbe number Nu b; a C element being double convex having an axial thickness of tc, radius of curvatures of R25 and R26, said C element being spaced from said B element by an axial spacing Sb, an index of refraction Nc and an Abbe number Nu c; a D element being double concave having an axial thickness of td, radius of curvatures of R27 and R28, said D element being in contact with said C element, an index of refraction Nd, and an Abbe number Nu d; an E element being double concave having an axial thickness te, radius of curvatures of R29 and R30, said E element being spaced from said D element by an axial spacing S3, an index of refraction Neand an Abbe number Nu e; an F element being double convex having an axial thcikness tf, radius of curvatures of R31 and R32, said F element being spaced from said E element by an axial spacing Se, an index of refraction Nf and an Abbe number Nu f; a G element being a negative meniscus having an axial thickness tg, radius of curvatures of R33 and R34, said G element being spaced from said F element by an axial spacing Sf, an index of refraction Ng and an Abbe number Nu g; an H element being double convex having an axial thickness of th, radius of curvatures of R35 and R36, said H element being in contact with said G element, an index of refraction Nh and an Abbe number Nu h; wherein said thicknesses, spacings, radii, indicies of refraction and Abbe numbers are substantially: R21 0.93 fl. ta 0.1 fl. R22 0.45 fl. tb 0.09 fl. R23 -0.45 fl. tc 0.09 fl. R24 0.70 fl. td 0.09 fl. R25 0.52 fl. te 0.09 fl. R26 0.64 fl. tf 0.09 fl. R27 -0.64 fl. tg 0.09 fl. R28 -0.35 fl. th 0.1 fl. R29 -0.27 fl. R30 -0.52 fl. Sb 0.001 fl. R31 0.52 fl. Sd 0.15 fl. R32 0.39 fl. Se 0.01 fl. R33 0.75 fl. Sf 0.001 fl. R34 -0.29 fl. R350.29 fl. R36 1.94 fl. Na 1.487 Nu a 84.5 Nb 1.517 Nu b 64.2 Nc 1.487 Nu c 84.5 Nd 1.517 Nu d 64.2 Ne 1.517 Nu e 64.2 Nf 1.487 Nu f 84.5 Ng 1.517 Nu g 64.2 Nh 1.487 Nu h 84.5 where Fl. is the focal length of the lens system.

Claim 15

An eight element lens system, comprising in combination: an A element being double convex having an axial thickness ta, radius of curvatures of R21 and R22, an index of refraction Na, and an Abbe number Nu a; a B element being a negative meniscus having an axial thickness tb, radius of curvatures of R23 and R24, said B element being in contact with said A element, an index of refraction Nb and an Abbe number Nu b; a C element being double convex having an axial thickness of tc, radius of curvatures of R25 and R26, said C element being spaced from said B element by an axial spacing Sb, an index of refraction Nc and an Abbe number Nu c; a D element being double concave having an axial thickness of td, radius of curvatures of R27 and R28, said D element being in contact with said C element, an index of refraction Nd, and an Abbe number Nu d; an E element being double concave having an axial thickness te, radius of curvatures of R29 and R30, said E element being spaced from said D element by an axial spacing S3, an index of refraction Neand an Abbe number Nu e; an F element being double convex having an axial thcikness tf, radius of curvatures of R31 and R32, said F element being spaced from said E element by an axial spacing Se, an index of refraction Nf and an Abbe number Nu f; a G element being a negative meniscus having an axial thickness tg, radius of curvatures of R33 and R34, said G element being spaced from said F element by an axial spacing Sf, an index of refraction Ng and an Abbe number Nu g; an H element being double convex having an axial thickness of th, radius of curvatures of R35 and R36, said H element being in contact with said G element, an index of refraction Nh and an Abbe number Nu h; wherein said thicknesses, spacings, radii, indicies of refraction and Abbe numbers are substantially: R21 0.93 fl. ta 0.1 fl. R22 0.45 fl. tb 0.09 fl. R23 -0.45 fl. tc 0.09 fl. R24 0.70 fl. td 0.09 fl. R25 0.52 fl. te 0.09 fl. R26 0.64 fl. tf 0.09 fl. R27 -0.64 fl. tg 0.09 fl. R28 -0.35 fl. th 0.1 fl. R29 -0.27 fl. R30 -0.52 fl. Sb 0.001 fl. R31 0.52 fl. Sd 0.15 fl. R32 0.39 fl. Se 0.01 fl. R33 0.75 fl. Sf 0.001 fl. R34 -0.29 fl. R350.29 fl. R36 1.94 fl. Na 1.487 Nu a 84.5 Nb 1.517 Nu b 64.2 Nc 1.487 Nu c 84.5 Nd 1.517 Nu d 64.2 Ne 1.517 Nu e 64.2 Nf 1.487 Nu f 84.5 Ng 1.517 Nu g 64.2 Nh 1.487 Nu h 84.5 where Fl. is the focal length of the lens system.