Anamorph.len - An anamorphic telextender

Anamorph.len - An anamorphic telextender

This example shows a simple Bravais system, which is a system where the object coincides with the image. The system goes on the back end of an ordinary lens to create a sharp image with different magnification in the x and y directions. This is accomplished using cylindrical lenses with power in the yz meridian.

The Bravais condition is imposed using a pk lnm command on surface 4. Actually, the condition cannot be precisely satisfied using cylindrical lenses because the thickness of the lenses displaces the image in the xz meridian. Therefore, the lens powers were chosen to make the image in the yz meridian lie on the same surface as the xz image.

Note the use of special apertures on surfaces 3 and 4 to model the rectangular lens.

*PARAXIAL CONSTANTS
   Effective focal length:   -4.160855    Lateral magnification:     2.019103
   Numerical aperture:        0.049281    Gaussian image height:    -1.009551
   Working F-number:         10.145865    Petzval radius:            4.269440
   Lagrange invariant:        0.050000

*PARAXIAL CONSTANTS - XZ PLANE
FRACTIONAL XZ APERTURE       1.000000    FRACTIONAL XZ OBJECT       1.000000
   Effective focal length:  5.0000e+39    Lateral magnification:     1.000000
   Numerical aperture:        0.099504    Gaussian image height:    -0.500000
   Working F-number:          5.024938    Petzval radius:          1.0000e+40
   Lagrange invariant:        0.050000

*LENS DATA
Anamorphic Bravais objective 2x
SRF      RADIUS      THICKNESS   APERTURE RADIUS       GLASS SPE   NOTE
  0        --        -10.000000      0.500000             AIR

  1      8.462000      0.150000      1.100000 A          SK16 C *
  2        --          4.100000      1.100000             AIR

  3     -1.370000      0.100000      0.943398 X          SK16 C *
  4        --          5.650000 P    0.943398 PX          AIR

  5        --            --          1.050000

*SURFACE TAG DATA
  1     CVX       --
  3     CVX       --

*PICKUPS
  4     LNM    1   4   10.000000
  4     AP     3
  4     SAP  A   3 A

*APERTURES
SRF   TYPE APERTURE RADIUS
  0     SPC     0.500000
  1     SPC     1.100000
  2     SPC     1.100000
  3     SPC     0.943398
     Special Aperture Group 0:
     A  ATP    Rectangle  AAC     Transmit  AAN       --
        AX1    -0.800000  AX2     0.800000  AY1    -0.500000  AY2     0.500000
  4     PKP     0.943398
     Special Aperture Group 0:
     A  ATP    Rectangle  AAC     Transmit  AAN       --
        AX1    -0.800000  AX2     0.800000  AY1    -0.500000  AY2     0.500000
  5     SPC     1.050000

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