From: astroelectronic@t-online.de   
      
   Hello,   
      
   I just got a huge collection of optical glasses. They are all from Schott. For   
   95% I did already find the data sheets, but a few are really difficult to find:   
      
   LgSK2   (it's listed in the 1989 price list)   
   PK51     (I did already find the N-PK51 data sheet)   
   SFN64   (it's listed in the 1989 price list, I did already find the SF64 data   
   sheet)   
   SSK5     (I did already find the N-SSK5 data sheet)   
   UK50     (it's listed in the 1989 price list just below "K50")   
   ZK7       (I did already find the ZKN7 data sheet)   
      
   I'm looking for the full data sheets which also lists the infrared refraction   
   indices.   
      
   Thanks,   
   Michael   
      
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