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Re: [ATM] Triplet

A R wrote:
> As my next Project I would like to make a 5" or 6" APO or semi-APO
> triplet around F8. I am looking for advice on the design and glasses
> to be used. I would like to use easy to get and work glasses, no
> exotic ultra expensive  or no longer produced glass. I like the idea
> of oil spaced since it means a lot less work. My budget is about US$
> 500 for the glasses. Any suggestions?
You might want to consider pricing the materials for S-NSL3/S-FPL51/S-BSL7
triplet (or something with nearly equivalent glass types).  Even though it
has one air-space that you did not want, it might give you an idea of one
of the possibilities (133 mm f/8):

Surf    Radius  Thickness     Glass  Diameter

 STO  Infinity   -3.930703                133
   2   564.492         9.7   S-NSL3       138
   3   268.696        28.2  S-FPL51       138
   4  -231.997       0.625                138
   5  -231.997         9.7   S-BSL7       138
   6  -2822.78    1033.772                138
 IMA  -396.834                           37.2
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