piclist 1998\11\13\053136a >
Thread: IR barrier and sunlight
picon face BY : Peter L. Peres email (remove spam text)

On Thu, 12 Nov 1998, Engineering Department wrote:

> >b. The unexposed DEVELOPED roll ends of Kodak Ektachrome slide film makes a
> >passable IR pass filter.  Looks opaque to us, but passes a good bit of IR.
> >Talk nice to the people at the photo shop and they'll give you all you can
> >use.  Make sure you get slide film though, the exposed developed ends
> >of negative film looks the same but is opaque to IR.
> I knew I'd heard of this trick, I just couldn't remember what film.

Along the same lines, black thin (usual) PVC electrician's tape is even
more transparent for IR (so are most PVC plastics unless filled). A quick
fix is a piece of that tape over the sensor window. You can add layers at



In reply to: <017201be0e75$2e7f26c0$81d16420@win>
See also: www.piclist.com/techref/io/irs.htm?key=ir
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