On Wednesday, November 9, 2016 at 1:36:34 AM UTC-5, schmittchens...@gmail.com   
   wrote:   
   > Dear,   
   > I wonder if there is someone with a copy of a Bausch & Lomb grating   
   catalogue. PDF is fine too. Later the company name changed to "Richardson   
   Grating", now part of Newport.   
   > I own an old (concave) grating and do not know the mechanical setup. Further   
   grating efficiency range would be helpful too.   
   >   
   > Sure, I can easily identify main orders (-2, -1, 0, 1, 2), the focal length,   
   I guess it is a 1:1 projection - but I miss values for angles in order to   
   minimize aberations.   
   >   
   > In my case the grating has the catalogue number 33-52-23-71.   
   >   
   > cheers   
   > Helge   
      
   Have you tried contacting Newport?  Someone there may be able to help.   
      
   George H.   
      
   --- SoupGate-Win32 v1.05   
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