Archived posting to the Leica Users Group, 2001/07/31
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George,
Here's an interesting idea to 'roll your own' IR filter:
http://www.rit.edu/~andpph/text-infrared-filter.html
The Rollei Infrarot filter is probably close to the Wratten 87, it's
real dark, I've seen a 29 and it's darker still. Notice in the chart at
the end of the article that the 87 filter cuts sharper than the 25.
Cheers,
Rich Lahrson
tripspud@transbay.net
George Kenney wrote:
> Rich,
>
> I was thinking Kodak or Konica. I've read on the web that Konica is
> more suitable for loading in subdued light, tho I'll bet that that can be
> done with Kodak, too. FWIW I've been using a fair quantity of Tech-
> Pan, loading in subdued light, and only recently learned it's
> supposed to be loaded in total darkness. Don't think it's made much
> difference in the negatives, tho maybe it has and I just don't know
> any better. Some time back (six months or so?) I tried a roll of Ilford
> for fun, but didn't think it was quite dramatic enough; possibly since
> it's not true IR.
>
>