AW: Modifying your camera so it can meter IR WAS: Is this true?

["Hermann Klecker" <infrared@xxxxxxxxxx>]

Don't forget to block the viewfinder as well. Light leaking through the view
finder will cause some wrong impression of IR sensitiy.

Hermann

-----Ursprüngliche Nachricht-----
Von: owner-infrared@xxxxx [mailto:owner-infrared@xxxxx]Im Auftrag von
David J. Romano
Gesendet: Montag, 26. Februar 2001 20:29
An: infrared@xxxxx
Betreff: Re: Modifying your camera so it can meter IR WAS: Is this true?


You may not even have to modify your camera. I don't. I use a Canon A-1
and simply meter through the filter. To find out if your camera's meter
is IR sensitive, just put a black IR filter over the lens (89B or 87)
making sure there is no light leakage around the outside and see if you
get a reading. Don't do this under fluorescent lights. Point the camera
at an incandescent bulb or go outside. If you get any reading other than
the lowest that the meter can give, you can probably meter IR without
modifying the camera. Not all cameras are created equal though. This may
not work on your camera.

I did a simple test. I set my ASA dial to 12,800 on my Canon. I covered
the camera's viewfinder so stray light couldn't get in through the
window. Using an 87 filter over the lens, I metered and exposed through
the filter at different ASA settings. Then I processed for my usual
time. I use HC-110 70F 5 min. I made a few prints from the negatives and
based on that, I knew the film speed for the 87 filter. Simple. My ASA
is 6400. I use a filter between the film rails, and meter through
another filter that I remove to compose the shot. I always shoot on
manual.

Recently, I've done the same thing using my Minolta Autometer 3F. With
this meter, I can place a filter over the light sensor whether I'm using
the meter as a reflected light, incident or flash meter. Using this
meter, I have to set the ASA to 3200 to get the same results as my Canon
at 6400.

David
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