P3D Re: PHOTO-3D digest 2609

["Greg Wageman" <gjw@xxxxxxxxxx>]

From: Michalo <Michalo@xxxxxxx>


>Is there a filter film or acitate material that can be wrapped around
>flourescent tube  lights to prevfent the bleeching out of stereo pairs
mounted
>in viewers that will be illuminated by these lights for extended
periods of
>time ?
>
>What would be the name of such a filter or material and where can it be
had ?


Assuming that *most* of the bleaching is occurring due to the presence
of ultraviolet light, using a u-v filter *might* help slow the process
down.  Slip-on UV filters for standard fluorescent tubes are available
from Light Impressions (among others).

I'm hedging here, because I don't think all of the fading is due
strictly to UV exposure.  Slides are known to fade in projection, and I
don't think standard tungsten lamps emit a whole lot of UV.  So UV
filtering may help, but probably won't completely eliminate fading.

>From the Light Impressions catalog:

  "Photographs and other works will fade and deteriorate when exposed to
ultraviolet rays.  These UV Shields filter out 92% of the ultraviolet
wave lengths from 0 to 385 millimicrons of fluorescent lamps.  If the
fluorescent tube breaks, the shields also contain the shattered glass
and prevent phosphor contamination through controlled gas release.  End
caps included.  For standard diameter, T-12 lamps.  To be used with
standard 400 M.A. lamps only.  Inside diameter:1 5/8."

In 48" length, they are $62.85 for a package of 12.  They're sold in
bulk because they're intended for museum/gallery applications.

Light Impressions
439 Monroe Avenue
Rochester, New York 14607-3717
Phone: 716.271.8960   Fax: 716.442.7318

     -Greg W. (gjw@xxxxxxxxxx)



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