On Friday, 27 May 2016 11:59:18 UTC+1, j.dem...@gmail.com  wrote:   
   > Hi All   
   >    
   > I was hoping someone might be able to help me. I plan to build a simple   
   interferometer, for which I require some 90 degree hollow roof prism mirrors    
   (or alternative roof mirrors) with roughly +- 10 arcsec dihedral angle   
   accuracy. I have checked the    
   usual scientific suppliers (Thorlabs etc) but costs are more than $300 for a   
   one-inch-square component, which is unfortunately too much for this particular   
   project. Is anyone able to recommend a more economic option? Ideally, I am   
   looking for a cost of <    
   $100 per roof mirror. Are they by chance a standard component in any existing   
   mass-produced products?   
   >    
   > Many thanks!   
   >    
   > John   
      
   Hi All   
      
   Many thanks for the helpful replies. It's definitely a roof mirror (not a   
   corner cube) that I need for this particular application. I will certainly   
   check out PLX. I'm also open to the idea of making one from scratch the target   
   accuracy of +- 10 arcsec    
   can be achieved without excessive pain - is there a good source for   
   fabrication details?   
      
   Best wishes   
      
   John   
      
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