film or digital? Makes a big difference due to the IR filtering of
digital cameras.
Paul
On May 13, 2006, at 7:22 PM, Ralf R. Radermacher wrote:
Been playing around with various IR filters this afternoon and found
that I'm getting the best results with a far 'stronger' filter than the
ubiquitous 695 nm variety (B+W 645, Hoya R72 etc.).
This one here...
http://www.photosight.ru/photo.php?photoid=1429884
...has been taken with a Wratten #87 gel filter. While one can still
see
a little trough the usual 695 nm filters, this one is totally opaque to
the human eye. Cut-off of the #87 is around 820 nm.
Exposure times are considerably longer, as well, in this case around 2
to 4 secs at f8 on a bright sunny day.
The RAW file was treated with Lightroom and only the Magenta info was
used in the grey conversion.
Comments and suggestions, as always, most welcome.
Ralf
--
Ralf R. Radermacher - DL9KCG - Köln/Cologne, Germany
private homepage: http://www.fotoralf.de
manual cameras and photo galleries - updated Jan. 10, 2005
Contarex - Kiev 60 - Horizon 202 - P6 mount lenses
