Wratten # 92 filter

[Russell Rosener <rrosener@xxxxxxxxxx>]

I recently dug out my wratten # 92 Gelatin filter to mount it inside my
OM-1 as per Andy's article. I can't find much data on the filter factor of
the #92.
Do I add 3 stops? 4 stops? Is it the same filter as my Hoya R72?
If so the Hoya R72 seems to give Ilford SFX 200 a better IR effect than the
standard #25. My tests show a slightly better response with the Hoya R72.

**************************
*"Two And Two Make Five!"*
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* GEORGE ORWELL. "1984"  *
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Russ Rosener
http://ascc.artsci.wustl.edu/~rrosener/


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