Compact three component objective lenses

Claim 2

A compact photographic objective lens consisting of three axially aligned air-spaced components having an overall length, from the entrance surface to the exit surface, less than oneeighth of its nominal focal length, said components arranged in the following order from the long conjugate side to the short conjugate side of said objective; a convergent first component having a convex surface toward said long conjugate; a bi-concave divergent second component; and a convergent third component having a convex surface toward said short conjugate, said first component having an Abbe Nu value at least 20 percent greater than the Abbe Nu value of said second component, the Petzval sum of said objective not exceeding 0.300.

Claim 3

A compact photographic objective lens comprising three axially aligned air-spaced components having an overall length, from the entrance surface to the exit surface, less than one-eighth of its nominal focal length, said components arranged in the following order from the long conjugate side to the short conjugate side of said objective; a convergent first component having a convex surface toward said long conjugate; a bi-concave civergent second component; and a convergent third component having a convex surface toward said short conjugate, said components having refractive indices selected so the absolute value of the sum of the algebraic differences in refractive index between adjacent components exceeds 35 percent of the central component''s refractivity and said first component having an Abbe Nu value at least 20 percent greater than the Abbe Nu value of said second component, the Petzval sum of said objective not exceeding 0.300.

Claim 4

A compact photographic objective lens comprising three axially aligned air-spaced components having an overall length, from the entrance surface to the exit surface, less than one-eighth of its nominal focal length, said components arranged in the following order from the long conjugate side to the short conjugate side of said objective; a convergent first component having a convex surface toward said long conjugate; a bi-concave civergent second component; and a convergent third component having a convex surface toward said short conjugate, said components having refractive indices selected so the absolute value of the sum of the algebraic differences in refractive index between adjacent components exceeds 35 percent of the central component''s refractivity and said first component having an Abbe Nu value at least 20 percent greater than the Abbe Nu value of said second component, the Petzval sum of said objective not exceeding 0.300.

Claim 5

The compact photographic objective lens described in claim 2 further comprising at least one aspherically curved surface for correcting spherical aberrations of said lens.

Claim 6

The compact photographic objective lens described in claim 3 wherein said first component is moved to accomplish focusing and having an aperture with a diameter greater than one-sixteenth of said lens'' nominal focal length.

Claim 7

The compact photographic objective lens described in claim 4, wherein said first component has a power at least three times the power of said lens.

Claim 8

A compact photographic objective lens comprising axially aligned front, middle, and rear elements having an overall length, from the entrance surface to the exit surface, less than one-eighth of its nominal focal length, said elements having refractive indices selected so the absolute value of the sum of the algebraic differences in refractive index between adjacent elements exceeds 35 percent of the central element''s refractivity and having surface curvatures and refractive indices preselected so the summation

Claim 9

A compact photographic objective lens comprising axially aligned front, middle, and rear elements having an overall length, from the entrance surface to the exit surface, less than one-eighth of its nominal focal length, said elements having refractive indices selected so the absolute value of the sum of the algebraic differences in refractive index between adjacent elements exceeds 35 percent of the central element''s refractivity and having surface curvatures and refractive indices preselected so the summation

Claim 10

The compact photographic objective lens of claim 1 wherein said front, middle, and rear components each comprise single optical lens elements.

Claim 11

The compact phoTographic objective lens of claim 6 wherein said three axially aligned elements are air-spaced and arranged in the following order from the long conjugate side to the short conjugate side of said compact objective and comprising: a convergent first element having a convex surface toward said long conjugate; a bi-concave divergent second element; and a convergent third element having a convex surface toward said short conjugate.

Claim 12

The compact photographic objective lens of claim 6 further characterized in that at least one surface is aspheric.

Claim 13

The compact photographic objective lens of claim 6 wherein said first element is moved to accomplish focusing.

Claim 14

The compact photographic objective lens of claim 10 further characterized in that two surfaces of said divergent second element are aspheric and can be mathematically described by a polynomial equation having at least the following terms:

Claim 15

The compact photographic objective lens of claim 10 wherein the Abbe value of said convergent first element is at least 20 percent greater than the Abbe value of said divergent second element.

Claim 16

A compact photographic objective lens comprising three axially aligned components having an overall length, from the entrance surface to the exit surface, less than one-eighth of its nominal focal length, said components having refractive indices selected so the absolute value of the sum of the algebraic differences in refractive index between adjacent components exceeds 35 percent of the central component''s refractivity and a Petzval sum not exceeding 0.300.

Claim 17

A compact photographic objective lens comprising three axially aligned components having an overall length, from the entrance surface to the exit surface, less than one-eighth of its nominal focal length, said components having refractive indices selected so the absolute value of the sum of the algebraic differences in refractive index between adjacent components exceeds 35 percent of the central component''s refractivity and a Petzval sum not exceeding 0.300.

Claim 18

The compact photographic objective lens of claim 13 wherein said three axially aligned components are air-spaced single elements arranged in the following order from the long conjugate side to the short conjugate side of said compact objective and comprising: a convergent first element having a convex surface toward said long conjugate; a bi-concave divergent second element; and a convergent third element having a convex surface toward said short conjugate.

Claim 19

The compact photographic objective lens of claim 14 further characterized in that at least one surface has an aspheric curvature to correct spherical aberration.

Claim 20

The compact photographic objective lens of claim 15 further characterized in that two surfaces of said divergent second element are aspheric and can be mathematically described by a polynomial equation having at least the following terms:

Claim 21

The compact photographic objective lens of claim 14 wherein said first element is moved to accomplish focusing.

Claim 22

The compact photographic objective lens of claim 17 wherein the Abbe value of said convergent first element is at least 20 percent greater than the Abbe value of said divergent second element.

Claim 23

The compact photographic objective lens described in claim 17 wherein said first element has a power at least three times the power of said objective lens.

Claim 24

The compact photographic objective lens of claim 14 wherein the refractive index of said first and said third element is greater than 1.55, and the refractive index of said second element is less than 1.70.

Claim 25

The compact photographic objective lens of claim 20 wherein the Abbe Nu value of each of said first and said third elements exceeds 40 and the Abbe Nu value of said second elEment ranges from 20 to 55, said Abbe Nu value of said first element being at least 20 percent greater than said Abbe Nu value of said second element.

Claim 26

The compact photographic objective lens of claim 21 where the vertex radius of the first refractive surface lies in the range 0.14F to 0.50F, the vertex radius of the second refractive surface lies in the range -1.00F through infinity to 0.40F, the vertex radius of the third refractive surface lies in the range -0.18F to - Infinity , the vertex radius of the fourth refractive surface lies in the range 0.14F to 0.35F, the vertex radius of the fifth refractive surface lies in the range -0.80F through infinity to 0.80F, and the vertex radius of the sixth refractive surface lies in the range -0.60F to -0.16F.

Claim 27

The compact photographic objective lens of claim 21 having vertex radii within the following limits:

Claim 28

A compact photographic lens comprising three axially aligned air-spaced elements arranged in the following order from the long conjugate side to the short conjugate side of said objective lens: a convergent first element having a convex surface toward said long conjugate, a bi-concave divergent second element, and a convergent third element having a convex surface toward said short conjugate, said compact objective lens having an overall length, from the entrance surface to the exit surface, less than one-eighth of its nominal focal length and a Petzval sum not exceeding 0.300, and: said first element having a refractive index greater than 1.55, and an Abbe Nu value both greater than 40 and at least 1.2 times the Abbe Nu value of said second element, a front vertex radius R1 in the range from 0.14F to 0.50F, and a rear vertex radius R2 in the range from -1.00F through infinity to 0.40F; said second element having a refractive index less than 1.70, an Abbe Nu value in the range 20 to 55, a front vertex radius R3 in the range from -0.18F to - Infinity , and a rear vertex radius R4 in the range from 0.14F to 0.35F; said third element having a refractive index greater than 1.55, an Abbe Nu value greater than 40, a front vertex radius R5 in the range from -0.80F through infinity to 0.80F, and a rear vertex radius R6 in the range from -0.60F to -0.16F, said refractive indices selected so the numerical differences in refractive index between adjacent elements exceeds 35 percent of the second element''s refractivity; and wherein refractive indices are specified for a light wavelength of 587.6 nanometers and R1, R2, R3, R4, R5, R6 represent vertex radii of curvature of their respective refractive surfaces from said objective''s long conjugate side to its short conjugate side.

Claim 29

A compact photographic lens comprising three axially aligned air-spaced elements arranged in the following order from the long conjugate side to the short conjugate side of said objective lens: a convergent first element having a convex surface toward said long conjugate, a bi-concave divergent second element, and a convergent third element having a convex surface toward said short conjugate, said compact objective lens having an overall length, from the entrance surface to the exit surface, less than one-eighth of its nominal focal length and a Petzval sum not exceeding 0.300, and: said first element having a refractive index greater than 1.55, and an Abbe Nu value both greater than 40 and at least 1.2 times the Abbe Nu value of said second element, a front vertex radius R1 in the range from 0.14F to 0.50F, and a rear vertex radius R2 in the range from -1.00F through infinity to 0.40F; said second element having a refractive index less than 1.70, an Abbe Nu value in the range 20 to 55, a front vertex radius R3 in the range from -0.18F to - Infinity , and a rear vertex radius R4 in the range from 0.14F to 0.35F; said third element having a refractive index greater than 1.55, an Abbe Nu value greater than 40, a front vertex radius R5 in the range from -0.80F through infinity to 0.80F, and a rear vertex radius R6 in the range from -0.60F to -0.16F, said refractive indices selected so the numerical differences in refractive index between adjacent elements exceeds 35 percent of the second element''s refractivity; and wherein refractive indices are specified for a light wavelength of 587.6 nanometers and R1, R2, R3, R4, R5, R6 represent vertex radii of curvature of their respective refractive surfaces from said objective''s long conjugate side to its short conjugate side.

Claim 30

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.696 f/8.6 LENS nd Nu d Radii Thicknesses I 1.678 55.2 R1 0.1823 t1 0.0153 R2 plano s1 0.0137 II 1.519 44.4 R3 -0.2585 t2 0.0065 R4 0.1624 s2 0.0199 III 1.615 51.2 R5 -2.578 t3 0.0142 R6 -0.2496 s3 0.9708 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R5 and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear, (s1 being variable); R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 31

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.696 f/8.6 LENS nd Nu d Radii Thicknesses I 1.678 55.2 R1 0.1823 t1 0.0153 R2 plano s1 0.0137 II 1.519 44.4 R3 -0.2585 t2 0.0065 R4 0.1624 s2 0.0199 III 1.615 51.2 R5 -2.578 t3 0.0142 R6 -0.2496 s3 0.9708 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R5 and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear, (s1 being variable); R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 32

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.0614 f/8.6 LENS nd Nu d RADII THICKNESSES I 1.678 55.2 R1 0.1915 t1 0.0141 R2 -7.632 s1 0.0106 II 1.519 44.4 R3 -0.2189 t2 0.0067 R4 0.1795 s2 0.0168 III 1.611 55.9 R5 -1.0021 t3 0.0132 R6 -0.2021 s3 0.9946 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R5 and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces respectively, from front to rear, (s1 being variable); R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 33

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.0614 f/8.6 LENS nd Nu d RADII THICKNESSES I 1.678 55.2 R1 0.1915 t1 0.0141 R2 -7.632 s1 0.0106 II 1.519 44.4 R3 -0.2189 t2 0.0067 R4 0.1795 s2 0.0168 III 1.611 55.9 R5 -1.0021 t3 0.0132 R6 -0.2021 s3 0.9946 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R5 and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces respectively, from front to rear, (s1 being variable); R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 34

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.120 f/8.6 LENS nd Nu d RADII THICKNESSES I 1.836 42.3 R1 0.2568 t1 0.0200 R2 0.6078 s1 0.0341 II 1.617 31.0 R3 -0.5648 t2 0.0100 R4 0.2938 s2 0.0359 III 1.836 42.3 R5 -14.63 t3 0.0200 R6 -0.3959 s3 0.937 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R4, R5, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces respectively, from front to rear; R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 35

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.120 f/8.6 LENS nd Nu d RADII THICKNESSES I 1.836 42.3 R1 0.2568 t1 0.0200 R2 0.6078 s1 0.0341 II 1.617 31.0 R3 -0.5648 t2 0.0100 R4 0.2938 s2 0.0359 III 1.836 42.3 R5 -14.63 t3 0.0200 R6 -0.3959 s3 0.937 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R4, R5, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces respectively, from front to rear; R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 36

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.120 f/8.6 LENS nd Nu d RADII THICKNESSES I 1.729 54.2 R1 0.2538 t1 0.0200 R2 2.430 s1 0.0302 II 1.596 39.2 R3 -0.3871 t2 0.0100 R4 0.2555 s2 0.0398 III 1.788 50.5 R5 -2.283 t3 0.0200 R6 -0.3395 s3 0.9276 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R4, R5, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear; R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 37

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.120 f/8.6 LENS nd Nu d RADII THICKNESSES I 1.729 54.2 R1 0.2538 t1 0.0200 R2 2.430 s1 0.0302 II 1.596 39.2 R3 -0.3871 t2 0.0100 R4 0.2555 s2 0.0398 III 1.788 50.5 R5 -2.283 t3 0.0200 R6 -0.3395 s3 0.9276 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R4, R5, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear; R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 38

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.120 f/8.6 LENS nd Nu d Radii ThicknessesI 1.802 44.3 R1 0.2583 t1 0.0200 R2 0.5146 s1 0.0420 II 1.617 31.0 R3 -0.4750 t2 0.0100 R4 0.3389 s2 0.0280 III 1.881 41.0 R5 21.42 t3 0.0200 R6 -0.3848 s3 0.9412 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R4, R5 and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear; R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 39

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.120 f/8.6 LENS nd Nu d Radii ThicknessesI 1.802 44.3 R1 0.2583 t1 0.0200 R2 0.5146 s1 0.0420 II 1.617 31.0 R3 -0.4750 t2 0.0100 R4 0.3389 s2 0.0280 III 1.881 41.0 R5 21.42 t3 0.0200 R6 -0.3848 s3 0.9412 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R4, R5 and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear; R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 40

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.089 f/8.6 LENS nd Nu d Radii Thicknesses I 1.613 57.4 R1 0.1775 t1 0.0213 R2 2.027 s1 0.0139 II 1.519 44.4 R3 -0.2928 t2 0.0091 R4 0.1605 s2 0.0264 III 1.697 56.2 R5 1.490 t3 0.0183 R6 -0.3379 s3 0.9619 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R5, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear, (s1 being variable); R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 41

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.089 f/8.6 LENS nd Nu d Radii Thicknesses I 1.613 57.4 R1 0.1775 t1 0.0213 R2 2.027 s1 0.0139 II 1.519 44.4 R3 -0.2928 t2 0.0091 R4 0.1605 s2 0.0264 III 1.697 56.2 R5 1.490 t3 0.0183 R6 -0.3379 s3 0.9619 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R5, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear, (s1 being variable); R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 42

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.0729 P 0.028 f/8.6 LENS nd Nu d Radii Thicknesses I 1.519 44.4 R1 -0.2635 t1 0.0080 R2 -6.7715 s1 0.0169 II 1.678 55.2 R3 0.1890 t2 0.0329 R4 -0.2386 s2 0.0071 III 1.519 44.4 R5 -0.5510 t3 0.0080 R6 0.1775 s3 1.0624 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R5, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear, (s1 being variable); R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 43

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.0729 P 0.028 f/8.6 LENS nd Nu d Radii Thicknesses I 1.519 44.4 R1 -0.2635 t1 0.0080 R2 -6.7715 s1 0.0169 II 1.678 55.2 R3 0.1890 t2 0.0329 R4 -0.2386 s2 0.0071 III 1.519 44.4 R5 -0.5510 t3 0.0080 R6 0.1775 s3 1.0624 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R5, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear, (s1 being variable); R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 44

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.0683 f/8.6 LENS nd Nu d Radii Thicknesses I 1.678 55.2 R1 0.1828 t1 0.0153 R2 plano s1 0.0133 II 1.519 44.4 R3 -0.2549 t2 0.0065 R4 0.1634 s2 0.0189 III 1.615 51.2 R5 -2.249 t3 0.0143 R6 -0.2440 s3 0.9731 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R5, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear, (s1 being variable); R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 45

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.0683 f/8.6 LENS nd Nu d Radii Thicknesses I 1.678 55.2 R1 0.1828 t1 0.0153 R2 plano s1 0.0133 II 1.519 44.4 R3 -0.2549 t2 0.0065 R4 0.1634 s2 0.0189 III 1.615 51.2 R5 -2.249 t3 0.0143 R6 -0.2440 s3 0.9731 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R5, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear, (s1 being variable); R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 46

A compact, three element photographic objective lens having the design parameters for unit focal length, F, Represented in the following table: F 1.000 L.O.A. 0.1149 f/6.3 LENS nd Nu d Radii Thicknesses I 2.4176 55.9 R1 0.2467 t1 0.0137 R2 0.3277 s1 0.0369 II 1.9212 35.7 R3 15.22 t2 0.0077 R4 0.4119 s2 0.0449 III 2.4176 55.9 R5 -0.8651 t3 0.0117 R6 -0.4530 s3 0.9308 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R4, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear; R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 47

A compact, three element photographic objective lens having the design parameters for unit focal length, F, Represented in the following table: F 1.000 L.O.A. 0.1149 f/6.3 LENS nd Nu d Radii Thicknesses I 2.4176 55.9 R1 0.2467 t1 0.0137 R2 0.3277 s1 0.0369 II 1.9212 35.7 R3 15.22 t2 0.0077 R4 0.4119 s2 0.0449 III 2.4176 55.9 R5 -0.8651 t3 0.0117 R6 -0.4530 s3 0.9308 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R4, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear; R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 48

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.1214 f/8.0 LENS nd Nu d Radii Thicknesses I 1.641 60.1 R1 0.2002 t1 0.0240 R2 1.1883 s1 0.0235 II 1.519 44.4 R3 -0.5478* t2 0.0075 R4 0.1844* s2 0.0484 III 1.583 59.5 R5 1.4240 t3 0.0180 R6 -0.4219 s3 0.9133 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R4, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear; R3 represents the vertex radius of an aspheric surface contoured according to the formula:

Claim 49

A compact, three element photographic objective lens having the design parameters for unit focal length, F, represented in the following table: F 1.000 L.O.A. 0.1214 f/8.0 LENS nd Nu d Radii Thicknesses I 1.641 60.1 R1 0.2002 t1 0.0240 R2 1.1883 s1 0.0235 II 1.519 44.4 R3 -0.5478* t2 0.0075 R4 0.1844* s2 0.0484 III 1.583 59.5 R5 1.4240 t3 0.0180 R6 -0.4219 s3 0.9133 wherein Roman numerals identify lens elements in order from front to rear; nd is the refractive index for a light wavelength of 587.6 nanometers; Nu d is Abbe''s ratio; R1, R2, R4, and R6 represent radii of successive refractive surfaces from front to rear; t and s represent thicknesses of lens elements and air spaces, respectively, from front to rear; R3 represents the vertex radius of an aspheric surface contoured according to the formula: