hyfalcon
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Wood's glass
This is to be used to filter out the visible spectrum from a black light LED flashlight. There is still enough visible light coming off these LED's
that it washes the mineral florescence right out of the mineral. Wood's glass is what is/was used in the mercury vapor black light mineral lights
from yesteryear. Anyone have a lead on where I could obtain a 50mm/2in piece? I'm even capable of cutting and grinding a larger piece to fit IF I can
find any.
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jwpa17
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The photo store B H Photo Video lists a Rosco filter providing this for $8.95. It is "temporary unavailable." The Rosco site doesn't seem to list
this filter. However, I noticed that their polyester filters generally have a transmission of about 40% from 370-400 nm, so you could, in principle,
use a red filter. The "UV" LEDs don't output much red as I recall, so you'll end up with about half-intensity UV. Rosco USED to make a sample pack
available for about $10. Of course, that was eons ago - sorry.
Also, FWIW, Wikipedia mentions that "black light" tubes have a similar transmission to Wood's glass (although not made of Wood's glass), so you could
(carefully) cut a black light tube. Rather dangerous, though.
[Edited on 19-3-2014 by jwpa17]
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thesmug
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http://www.bhphotovideo.com/bnh/controller/home?O=&sku=1...
Is that good?
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hyfalcon
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Rosco filters won't do the job. They still allow some visible light through. All I'm wanting is the UV spectrum to come through.
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Praxichys
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Get a bandpass filter from Edmond Optics in the UV range:
http://www.edmundoptics.com/optics/optical-filters/
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