Re., [ATM] Subaperture Corrector for Two Mirror Telescope

["David Harbour" <scarab2@cox.net>]

Richard,

You might want to look at this, play around with the idea:

http://www.atmsite.org/contrib/Harbour/StoppingDown.html

No corrector is needed when stopping down at the entrance or exit pupil of a
two mirror telescope. It just simply becomes a "sub aperture two mirror
telescope". Field is as flat as original full aperture operation. As simple
as the wheel (unless I misunderstand your proposition here, which is
possible)-

Dave


>Didn't someone want something like this at one time:

>Surf      Radius      Thickness     Glass      Diameter       Conic
 >OBJ     Infinity      Infinity                       0           0
 >STO     Infinity       11.6805                     500           0
   >2    -2676.833      -11.6805    MIRROR           500  -0.7545292
   >3     Infinity     -1009.423                     500           0
   >4    -834.4364      1009.423    MIRROR      125.2636           0  !!!
   >5     Infinity       11.6805                  58.758           0
   >6     Infinity             8     N-BK7          73.1           0
   >7     113.6622          13.5     N-SK5          73.1           0
   >8    -254.2492           0.5                    73.1           0
   >9     157.3644           4.5      N-K5          73.1           0
  >10     77.54262      299.9817                    73.1           0
 >IMA     Infinity                              40.29845           0

>The corrector may be a tad oversized, but the [N-]BK7 lens is OTS
>as Melles Griot LFF357.  The other lenses are sized to match.

>The field isn't really perfectly flat, but the visual Strehl ratio
>in the center is still 0.989.



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