Re: frames/UV transmittance.
Jacques Augustowski (jacquesa@acd.ufrj.br)
Thu, 02 Apr 1998 00:45:17 -0300 (GRNLNDST)
> Hi,
Quartz glass (dichroic,xenon, halogen and others) doesnt block the
> U.V. spectrum, well almost all spectrum. The more lead a glass has the
> greener it is. The so called crystal is sometimes confused with
> tempered glass and "pyrex". The normal household glassware that goes
> over direct flames, when viewed sideways is blueish, this glass is
> pirex. Corning Glass Co. will inform the spectral charateristics of
> their glass. Acrylics and other transparant plastic when not doped with
> U.V. blocking compounds are trasparent to U.V. I still have to test my
> large format lens board that are made of black acrylic, film is
> sensitive to some portion of the U.V. spetrum. My frames are all
> acrylic, no glass.
regards,
Jacques
Rio, Brasil
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