Helen Bach
(K=2331) - Comment Date 7/30/2005
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Hi Stuart,
It depends on which IR film you are using, how you are metering and which filter you will be using.
When I use Kodak HIE with the equivalent of an 87 filter and meter through the filter (ie TTL metering) I set the meter to EI 800. When I use Maco 820c I use a deep red filter (approximately a 29 equivalent)and a separate meter which is set to EI 6, with a deeper filter I use EI 3. Maco have recently introduced a faster version of that film, which they say is two stops faster, but I have yet to try it.
I usually develop HIE in Diafine or DiLuxol Vitesse, and Maco 820c in W2D2+.
Which combination of film and filter were you thinking of using?
Best, Helen
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Helen Bach
(K=2331) - Comment Date 7/30/2005
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Forgot to say that I only bracket one stop, if I bracket at all. To begin with you will need to bracket about two stops, as you say, to get to know the relationship between your metering technique and the film's sensitivity.
Unless you have a meter that has been modified for IR (I have one but hardly ever use it) there will be a difference between how your meter reads and how the film 'sees' mixed light - ie the difference between the meter reading and the film's sensitivity changes as the proportions of IR and other wavelengths change. This is something that you need to get used to and compensate for.
Best,
Helen
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stuart kennedy
(K=172) - Comment Date 8/1/2005
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I'll be using Kodak HIE with a standard red hoya filter, with TTL metering.
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Helen Bach
(K=2331) - Comment Date 8/3/2005
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Stuart,
With a normal red (Wratten 25) filter, try setting your TTL meter to EI 400. If you were to use a separate meter, set that to EI 50.
Best,
Helen
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Brent Tannehill
(K=314) - Comment Date 8/7/2005
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You may want to purchase an infra-red light meter. David Romano makes them, and you can get the details at www.davidromano.com
They're expensive, but you don't have to bracket (except when the exposure is right between two apertures). By not bracketing, you save lots of money, and it will pay for itself in a few years.
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Helen Bach
(K=2331) - Comment Date 8/7/2005
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I have had an IR light meter for six or seven years and hardly ever use it. I have found that once you know the relationship between your camera's light meter and the film, using a particular filter, you may find that you don't need one. I believe that you would have to use a great deal of IR film to recoup the cost of the meter.
Remember that the meter is modified to suit one film and one filter - ie a certain IR pass band. If you use a different film or a different filter you will have the same problem of differing spectral sensitivity. If you are using a red filter rather than a visually opaque filter the IR meter may give incorrect readings - it isn't a magic bullet.
That's been my experience anyway - if yours has been any different I'd be interested to hear.
Thanks,
Helen
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Helen Bach
(K=2331) - Comment Date 8/7/2005
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Re-reading my post makes me realise that I was a bit negative about IR meters - they are definitely worth thinking about if you plan to shoot a lot of IR film. Good suggestion Brent.
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