Re: Infrared-stop filter - Help!

[Michel Wurtz - LTE <mw@xxxxxxxxxxxxxxxxxxx>]

David N. Horn wrote:
> 
...
> I checked WJ's home page and found the wratten 43/44A and B&W 489 listed
> as
> "IR stop". I looked up the 44A and called B&W. This filter does stop IR,
> but also a lot
> in the 400-560nm range. It is described as "light blue-green" - not what
> I want.
> 
> Can anyone please suggest any other options!

It seems that the Nikon (dark) green filter (obviously only available in
glass 52mm screw mounting) stop IR : I tried it some years ago with
Ektachrome IR and got a monochromatic blue slide ! (with a Wratten green
filter like 55 or 58, the result is blue+magenta).

I don't remember the exact reference of the filter (but have it at home,
so just ask if you need it), but I think it has no Wratten equivalence.

- -- 
Michel Wurtz	ENGEES - Laboratoire Territoires & Environnement
		1, quai Koch - BP 1039, F-67070 STRASBOURG cedex
		Tel: +33 3.88.25.34.62    Fax: +33 3.88.37.04.97
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End of Infrared-Digest V0 #137
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