RE: IR lamps, & Using Camcorder to Previsualize IR pictures

[Rolland Elliott <rolland_elliott@xxxxxxxxx>]

Hi,  Peter De Smidt 
Subject: Infrared Lamps
You wrote:
"Has anyone used the infrared heater lamps for
portraiture with infrared
film? Any suggestions for beginning exposures?"

I haven't actually used infrared heater lamps for
portrature, but acording to Walter Clark's Book,
"Infrared Photography" they do not produce more
actinic IR light than regular tungsten bulbs.  They do
produce more long wave IR radiation in the wavelengths
above 1000nm.  However, Kodak IR film is not sensitive
to wavelengths above 1000nm so the only benefit they
provide is to keep your model warm.  

On the other hand tungsten lamps also emit quite a bit
of heat and will do a decent job  keeping your model
warm.  It will also be easier for you to focus your
camera using tunsten lights, and they are cheaper than
IR heater lamps.

Therefore I'd recommend just sticking with regular
cheap tungsten lights.  For exposure under tungsten
lights I'd recommending setting your ISO to 800 and
using your camera's meter with NO filter.  Develop
according to Kodak's recommended times with Xtol. 
Since tungsten light is so rich is red wavelengths a
filter is not needed.  If you really want to use a
filter, a yellow filter will give you good results,
and allow easy focusing.

Peace Rolland Elliott   

P.S. (actinic means radiation capable of a marked
photochemical reaction)

In addition Mike Brouphy wrote:
"You will learn from it but the only way to
acquire the skills needed to truly visualize in IR is
to shoot, shoot, andshoot some more."

Or alternately you could put an 87 filter over your
camcorder and previsuallize all of your scenes before
wasting a single frame of film.  Most camcorder's are
sensitive to IR light and provide a great way to
visualize how a B&W IR photo will turn out.

Peace Rolland
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