On Monday, December 7, 2015 at 4:18:28 PM UTC-5, Phil Hobbs wrote:   
   > Hi, all,   
   >   
   > Back in the day, Corning used to make sharp-cut red filters with   
   > spectacularly low autofluorescence compared with Hoya and Schott ones.   
   > H & S seem to light up like a Christmas tree at a wavelength about   
   > 50-100 nm to the red of the edge, which is very inconvenient at the moment.   
   >   
   > Corning doesn't make coloured glass filters any more.   
   >   
   > Two questions for the assembled multitude:   
   >   
   > 1. Does anyone know who they sold the line to. if anybody, and if   
   > they're still available?   
   >   
   > 2. Any wisdom on 800-nm-ish sharp cut longpass filters with super low   
   > autofluorescence?   
   >   
   > Thanks   
   >   
   > Phil Hobbs   
   > --   
   > Dr Philip C D Hobbs   
   > Principal Consultant   
   > ElectroOptical Innovations LLC   
   > Optics, Electro-optics, Photonics, Analog Electronics   
   >   
   > 160 North State Road #203   
   > Briarcliff Manor NY 10510   
   >   
   > hobbs at electrooptical dot net   
   > http://electrooptical.net   
      
   How much money, how many, size?   
   (my first hit on Thor labs was a $73   
   1" (?) piece, )   
   I get big interference filters from Custom Scientific, AZ,   
   for less than that, (per area.)   
   (I only mention them selfishly, 'cause I want   
   them to be around ~5 years from now, depending on sales.)   
      
   If you want just absorbing glass,   
   (like for an argon laser into a spectrometer)   
   what's the intensity? (maybe china?, I dunno)   
   At the very low end,   
   I've got plastic filter samples for lighting,   
   Lee filters, with transmission vs wavelength plots.   
      
   George H.   
      
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