RE: IR light meter

[Adrian Smythe-Hunt <intihuatana@xxxxxxxxx>]

------Original Message------
From: Foamb <cpurdum@xxxxxxxxxxx>
To: infrared@xxxxx
Sent: February 26, 2000 7:06:09 PM GMT
Subject: IR light meter


hello all,

the Jan/Feb issue of Photo Techniques has an article about making IR
preview devices (night vision scope with a #87 filter over the lens) and
an handheld IR meter. it seems that the meter is disassembled and the
light blue IR blocking filter in front of the photo diode is taken out
and replaced with a #87. also added is a Melles Griot 035WP622 filter
that "cuts out light beyond the film's sensitivity and makes the
metering independent of light source".

Has anyone tried this? I'm thinking of using a Gossen Luna Pro digital
and trying it out unless someone has experience with the disassembly of
meters and can recommend a better choice. The pentax digital spot was
mentioned but required considerable effort to disassemble and modify,
not to mention that they aren't exactly cheap.

I've never heard of the Melles Griot 035WP622 filter and was hoping that
someone knew where to get one. The article is titled "Controlling
Infrared" and has some very nice shots using a 4x5 and the tools
mentioned above. The website (no article there, just ordering info) for
those interested is: www.phototechmag.com

thanks

Chris Purdum

******************************************************************
Yes, I read that article as well. I enjoyed the photographs, but found that the author is a bit extreme in expenses for preview devices. He suggests purchasing a night scope for previewing IR. This is not a bad idea, except that one runs $1500 U.S.!
Disassembling a perfectly good meter and hacking it up for IR use seems a bit impractical, unless you have one lying around you don't need. Better to fit a removable filter over the meter's sensor, or better yet, use the money to purchase IR film and learn to shoot it under varying lighing conditions. After shooting film enough, you will have an IR meter in your head, which is considerably less likely to be forgotten when going out to shoot!

Adrian Smythe-Hunt.
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