Forrest W Christian wrote:
> What I'd like to find is someone who makes fairly inexpensive gels which
> are available in different colors which correspond to say every 20nm of
> the light spectrum, and which are fairly consistent in transmission and
> "bandwidth".
>
> Ideas?

Last weekend my brother and I stopped by the Lowell observatory in 
Flagstaff. One of the exhibits was a light pollution filters which was 
effective against narrow-band light sources (low pressure sodium, IIRC). 
Search for "light pollution filter" on Google.

But the first thing that came to mind, was a setup with two prisms and a 
piece of cardboard with a cutout for a filter. May not be as good at getting 
your point across, though.

Vitaliy 

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