Re: [ATM] 290 mm f/7.5 Refractor Design

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

Richard F.L.R. Snashall wrote:

> From what I've been able to change, this geometry only seems to work 
>for a narrow
>range around f/7.5.
>
If I didn't know better (and maybe I don't), I'd swear my ex-employer
is driving the S/W requirements for ZEMAX.  It's getting so you have
to coax and cajole it into a solution.

Surf     Radius   Thickness   Glass   Diameter

 STO   Infinity    -10.9429                250
   2    719.405        35.9   N-BK7        260
   3   -853.499      35.683                260
   4   -777.408        16.6      F2        260
   5    10266.8      1100.7                260
   6    6825.34         9.2      F2        120
   7   -1237.23      82.922                120
   8   -499.921         7.5   N-BK7        120
   9    12779.6    756.4894                120
  10   Infinity       0.094           42.20373
 IMA   Infinity                       42.19695

Visual Strehl 0.5546 for this 250 mm f/10; the length is just over f/8
doublet length.
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