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[ATM] F2.5 hyperbolic mirror for photograph.

Dear all,
 
There is no free lunch. For my F3.5 mirror, I decide to figure it to hyperbolic and apply 2 sets of 4-elements correctors for it. One set is full aperture for primary focus photograph @F2.5 with 22% CO providing 1 degree off axis diffaction limit image, the other small set along with a diagonal for visual also @2.5 with 27% CO and vignetting which are both a little bigger then normal newtonian. The bottom line is a very fast system for both visual & photograph.
 
This is the design data for 1 degree off axis, we can add a diagonal mirror at position 2 with 160mm thickness, the light from diagonal mirror can reach the tube wall and the first lens.
 
 SRF        CC          AD          AE          AF          AG  1      -1.764772      --          --          --          --    
 SRF      RADIUS      THICKNESS   APERTURE RADIUS       GLASS  SPE  NOTE OBJ       --        1.0000e+20    1.7455e+18             AIR     
 AST  -2.1000e+03   -777.804874 V  153.000000 AS   REFL_HATCH   * 
  2        --       -160.000000     40.000000             AIR   * 
  3   -104.891151 V   -6.000000     33.000000          C-LAK4 C     4    -56.423738 V  -15.000000     33.000000 P         C-FK1 C     5    796.786584 V   -0.100000     33.000000 P           AIR     
  6    -59.795558 V   -6.000000     30.000000          C-LAK4 P     7    -34.295336 V  -10.000000     30.000000 P         C-FK1 P     8    -49.340782 V  -50.000000     30.000000 P           AIR     
  9        --            --         13.273212 S           AIR     
 IMS       --            --         13.273212 S                   
 
Glass are from China catalog as I would like to order finished lenses from Chinese vendor.
 
Best Regards,
Ukyo Chen
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