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Re: [ATM] Pretoria eyepiece


--- Peter John Smith <pjifl@bigpond.com.au> wrote:
 
> I have never seem specific details of the Pretoria. 

 Klee wrote up the design in TM#29 pp4-9. 
    
      Has 11 surfaces,uses some expensive glasses but
he says can be scaled to other less so:
 
   1) 98.5342mm  4mm Thick sf11 28mm ap
   2) -594.01    4         bk7  28
   3) 21.6056    37.14  Air     25.2
   4) field stop                37mm
   5) 242.428    8mm     LaFN21 42
   6)-51.1832    27.25  Air     42.5
   7) 98.5342    5mm      SF6   33.6
   8) 25.7854    11      LakN7  31
   9) -98.5342   2.53   Air     31
  10) 115.282    5mm    LaFN21  27.6
  11) -167.421   22     Air     26
  12)                           7 exit

There may be some typo errors in the article so
beware.
Tolerance is stated to be +-0.1mm
There were two made - this is back in 1982.Cann't
recall if they ever were offered on the market.

Ric



	
		
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