Viewer light colour temp

[T3D Bob Aldridge <bob.aldridge@xxxxxx>]

John Bercovitz wrote:

->How much value is there in color correcting a viewer's light?
->I can see that if a lamp is very weak in blue, you might not
->be able to achieve color balance with the Mk I eyeball.  I 
->wonder what the limits would be.
-> 
->It seems to me like you could achieve good color temperature 
->by painting with the barium sulfate John V recommends and then
->gluing a Wratten gel, something in the 82 series, over each 
->opening in the viewer behind the slide.  What is the color
->temp of the halogen lamps you sell for 2 D cells in the red
->button, George? 82, 82A, 82B, and 82C are +100K through +400K
->as I understand it.  82A is used with studio lamps and 82B
->is used with lower temp lamps - around 2900K.

This, of course, is pretty much the system used in the special model D
Viewmaster viewer that came with the Chinese Art set. Except the
reflector is the standard plastic VM one -  no barium sulphate anywhere!

I have no idea what colour the filter material is - I've never checked
it.

Bob Aldridge    Stereoscopic Society Projectionist


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