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Re: [ATM] Corrector/reducer for a fast Newtonian

Richard F.L.R. Snashall wrote:

>
>With your reduced requirements, maybe you could do it with a
>combination of some sort:
>
But if you really want some reduction (only about 7.5%; final
f.l. 2400 mm):

 SRF      RADIUS      THICKNESS   APERTURE RADIUS       GLASS  SPE  NOTE
 OBJ       --        1.0000e+20    8.9573e+17             AIR    

 AST  -5.2324e+03   -2.3953e+03    354.183374 A       REFLECT   *

  2    -82.118541    -11.000000     52.000000           N-KF9 C  
  3    -98.484794    -74.460707     52.000000             AIR    

  4   -387.714507     -5.500000     36.000000         N-KZFS4 C  
  5    -58.665327    -44.279620     36.000000             AIR    

  6    -69.823108     -9.500000     39.500000              F2 C  
  7    -51.548176    -19.500000     39.500000          N-FK51 C  
  8   -202.586262     -9.500000     39.500000          N-LAF7 C  
  9    957.085208    -50.000000     39.500000             AIR    

 IMS       --            --         21.561883                    

It is quite color-free over 400..1000 nm; some residual
spherochromatism.  Other aspects may be somewhat strange, I
think (look at lateral color, for example).

However, I make no claim that it is buildable... or cheap.
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