Re: Infrared-stop filter - Help!

[Helmut Faugel TE <htf@xxxxxxxxxx>]

On Fri, 11 Jul 1997, Willem-Jan Markerink wrote:
> On 11 Jul 97 at 11:53, 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.
> 
> Ask for the B+W 'Digital' filter, #486, a filter that cuts out both
> IR and UV, for use with digital and video cameras. It is colorless,
> with a nearly flat 90% transmission from 420nm to 670nm, dipping to
> 10% at 370nm and 720nm.
> I think the 489 is mainly a thermal-IR filter, like the ones you find 
> in slide projectors.

The B+W 'Digital' filter is the filter for CCDs (Rodenstock
also offers a similar filter) but the price in germay is about
two times higher than for circular polariser (more than DM 300.-)



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