From: pcdhSpamMeSenseless@electrooptical.net   
      
   Alex Red wrote:   
   > https://shop.schott.com/advanced_optics/Produkte/Optisches-Gla   
   /Optisches-Glas/Zink-Kron/N-ZK7/c/glass-N-ZK7   
   >   
   The N-series are the newer Pb- and As-free versions.   
      
   NZK7 != ZK7, NBK7 != BK7.   
      
   Cheers   
      
   Phil Hobbs   
      
   --   
   Dr Philip C D Hobbs   
   Principal Consultant   
   ElectroOptical Innovations LLC / Hobbs ElectroOptics   
   Optics, Electro-optics, Photonics, Analog Electronics   
   Briarcliff Manor NY 10510   
      
   http://electrooptical.net   
   http://hobbs-eo.com   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)