A lens design problem was proposed by a group of lens designers. Several alternative designs have been corrected on two different automatic correcting programs. The final designs are similar and exhibit a high degree of correction.
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The entrance pupil is 0.450 to right of first surface. The focal length is 1.253. The back focal length is 0.3573. The energy distribution curves shown in Fig. 1 were computed on a plane shifted 0.0560 from the paraxial focus.
The entrance pupil is 0.359 to right of first surface. The focal length is 1.011. The back focal length is 0.5550. The energy distribution curves shown in Fig. 2 were computed on a plane shifted —0.0025 from the paraxial focus. The glass data are approximations in this design.
The entrance pupil is 0 810 to the right of the front surface. The focal length is 1.000. The back focal length is 0.4033. The energy distribution curves shown in Fig. 2 were computed on a plane shifted —0.0010 from the paraxial focus.
The entrance pupil is 1.352 to the right of the first surface. The focal length is 1.000. The back focal length is 0.4017. The energy distribution curves shown in Fig. 2 were computed on a plane shifted — 0.0020 from the paraxial focus.
The entrance pupil is 0.707 to the right of the first surface. The focal length is 1.000. The back focal length is 0.1982. The energy distribution curves shown in Fig. 2 were computed on a plane shifted −0.0012 from the paraxial focus.
The entrance pupil is 0.450 to right of first surface. The focal length is 1.253. The back focal length is 0.3573. The energy distribution curves shown in Fig. 1 were computed on a plane shifted 0.0560 from the paraxial focus.
The entrance pupil is 0.359 to right of first surface. The focal length is 1.011. The back focal length is 0.5550. The energy distribution curves shown in Fig. 2 were computed on a plane shifted —0.0025 from the paraxial focus. The glass data are approximations in this design.
The entrance pupil is 0 810 to the right of the front surface. The focal length is 1.000. The back focal length is 0.4033. The energy distribution curves shown in Fig. 2 were computed on a plane shifted —0.0010 from the paraxial focus.
The entrance pupil is 1.352 to the right of the first surface. The focal length is 1.000. The back focal length is 0.4017. The energy distribution curves shown in Fig. 2 were computed on a plane shifted — 0.0020 from the paraxial focus.
The entrance pupil is 0.707 to the right of the first surface. The focal length is 1.000. The back focal length is 0.1982. The energy distribution curves shown in Fig. 2 were computed on a plane shifted −0.0012 from the paraxial focus.