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[ATM] RC design

Hi all,

I'm now fixing the numbers for my Ritchey-Chretien design.
Can you check if I made big mistakes or miscalculations?
Note that there is a diagonal mirror at 389mm from the primary that folds the light-path from the secondary to the side of the tube.

Here is my current design (all numbers other than focal ratios are millimeters):

406.40  Primary Diameter 
107.00  Secondary Diameter 
66.00  Diagonal Diameter (minor axis) 
508.00  Tube Diameter 
254.00  Tube Radius 
   
2.50  Primary Focal Ratio 
1016.00  Primary Focal Length 
389.31  Primary to Diagonal distance (so the cone obstruction equals the secondary shadow on the primary) 
   
152.00  Tube to Image plane 
406.00  Diagonal to Image plane 
   
13.00  Off-Axis radius of 100% illumination 
   
3861.06  Effective Focal Length (to give 100% illumination of off-axis radius considering the diagonal size) 
9.50  Effective Focal Ratio 
   
3.80  Secondary Amplification 
800.87  Primary to Secondary distance 
817.56  Secondary to Image Plane distance 
   
106.55  Minimum secondary diameter to give 100% illumination 
583.92  Secondary RoC
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