Re: Infrared-stop filter - Help!

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

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.


- -- 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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