Focusing IR

[Russell Rosener <rrosener@xxxxxxxxxx>]

>>With Konica stopping down to f16 or f22 should do it. Otherwise focus
>>visually
slightly in front of the subject if you want to use less depth of field.>>

I'd be careful not to stop down too far. IR film, and indeed ANY lens-film
system can create diffraction with a small aperture which actually degrades
resolution. Last year I shot some Konica IR in 35mm stopping a Nikon 28mm
lens all the way down to F16 or 22. I got some odd flare on highly
refelctive IR areas which actually worsened resolution. Every lens performs
best at a moderate aperture, such as f8.

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


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