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Re: [ATM] All Spherical Telescopes

Richard F.L.R. Snashall wrote:

>>Actually, 6 lenses doesn't seem to be far away.  From the "upgrade" above,
>>I slapped a couple of N-F2 elements inside and forced cementing.  It didn't
>>lose too much from the air-spaced doublet setup -- Visual Strehl still just
>>above 0.9 at the field edge.  It reduces the number of air-glass surfaces
>>to 4.
>>
With a little more tweaking, for example:

Surf      Radius  Thickness    Glass   Diameter
   4    Infinity   223.2473            38.57427
   5    326.6691         12   N-BAF4         70
   6   -119.0975          5  N-KZFS4         70
   7    119.0975         13   N-FK51         70
   8   -222.0438   406.4443                  70
   9    151.1151          8    N-FK5         40
  10    -57.5088          3  N-KZFS4         40
  11     57.5088        7.5    N-LF5         40
  12    -210.284   416.8137                  40
 IMA   -178.1494                       41.93773

has a visual Strehl of 0.924 at the edge.
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