On Thursday, June 22, 2017 at 9:42:09 AM UTC-4, javiermor...@gmail.com wrote:   
   > Hello folks,   
   >    
   > for our next project we ended up with a design which includes either a   
   biconvex lens or toroid, with conicity = 0. We are not sure about how easy   
   would be to fabricate this using ZnSe, is there anyone is this forum with   
   experience in manufacturing    
   something like that?   
   >    
   > Best wishes for everyone   
      
   Not sure about a toroid, but you could have someone grind you a double    
   convex lens.. is that the same as biconvex?     
      
   (Use to use ZnSe for IR spectroscopy.)   
      
   George H.   
      
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