ATM Wide Field Coma Corrector

[Aplanatic@aol.com]

Dear ATMers:

The following is an OSLO-like representation of a wide field coma corrector for a Newtonian.  It has been specifically tuned up for a 16" f/5 paraboloidal mirror.
It covers a very wide field (almost 4" diameter at the focal plane).  I might someday like to build this and I am looking for your inputs on the design and fabrication of the lens set.

Questions:  

Has it been optimized as best possible?  

Are there simplier coma correctors with similar performance?

Can it be fabricated by a careful amateur?

Thanks so much for taking a look.

Dave Rowe

*LENS DATA
16"f/5 Parabolic CC

 SRF RADIUS       THICKNESS  APERTURE   GLASS
 AST -4.0000e+03 -1.7596e+03 203.000000   Ref  (B=-1)  
  2  -104.700000 -7.200000   63.000000    F6 
  3  -124.200000 -57.700000  63.000000    AIR     
  4  -210.300000 -4.000000   55.000000    F5    
  5  -89.050000  -116.50000  55.000000    AIR     
  6  -158.800000 -15.000000  60.000000    SK6    
  7  2.3978e+03  -59.530000  60.000000    AIR     
 IMS    --       -0.921373 44.172942