Re: New infrared lith prints

[pauck@xxxxxx (Marco Pauck)]

> Perhaps I will soon get a chance to work under similar weather
> conditions myself: I'm going to spend my Christmas holidays on the
> beautiful dutch island of Ameland :-)...

Should be quite similar indeed. Empty lonely beaches are wonderful,
even (or especially?) in bad weather ...

> Therefore my question: How did
> you expose your IR films on Borkum? Something like "Wratten #25, one
> stop slower than the meter suggests" ?

I usually use Hoya R72 and RM90 filters for HIE. For the R72, an EI
of 15/25 and for the RM90, an EI of 11/10 works well. Metering is
*without* filter of course. I bracket +/- 1 or 2 f-stops around this
value.

I didn't evaluate it precisely, but with a really heavy overcasted sky,
the infrared part of the spectrum is probably affected to the same
degree as the shorter wavelengths. However, with just a little haze you
should substract perhaps one f-stop from your metering result.

When using a Wratten #25, the differences won't be that significant.

Have some nice holidays (and show us some results! ;-)

	Marco
-- 
Marco Pauck - WMD GmbH Hamburg, Germany - http://www.pauck.de/marco/
e-mail: marco@xxxxxxxx, phone: +49-40-58958-120, fax: +49-40-58958-199
For every complex problem, there is a solution that is simple, neat,
and wrong.  -- H. L. Mencken
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