Re: using Kodak Infrared B/W film?

["David J. Carlyon" <david@xxxxxxx>]

>Still there are questions that remain:
>
>	1) I plan to use mostly shots during daylight, with a wratten 25 
>(Std. Red) filter. Someone told me to rate the film at ISO 800, the FAQ I 
>think talks about ISO 50. I am confused.

I use the camera's built-in TTL meter, and set it for ISO 200, for outdoor
daytime sunny shots. If you're going to be developing it yourself in XTOL,
I have to add a few minutes to the recommended time, to avoid getting
horribly underexposed negatives though. ISO 200 seems to be the most common
setting, and it also recommends this in the information sheet you get with
the film, for sunny daylight.

>	2) Given that the IR mark on lenses is a bit off, I cannot 
>expect AF to work for me. So I'll use MF. What about the bulit in meter 
>of the camera? - can it be trusted, does it need correction, or is it all 
>guesswork?

If you're using a #25 filter, I wouldn't bother with IR focus correction,
at least not for your first roll, since you'll be getting enough visible
light in there anyway. You might find that you have to use correction, but
it varies according to lenses. Use smaller apertures for larger depth of
field, as well.

>	3) I use a Std. Red Filter. How much would a deep red (29) or IR 
>(87?) Filter accentuate the effect? - What about the use of normal 
>filters, like polarisers?

I've heard polarizers don't have much effect with IR film, though I've used
it as a sort of ND filter (stacked with a real ND filter and the red
filter) to drastically increase exposure times to get blurred water.

Don't sweat your first roll too much. Everybody does IR a bit differently -
you'll probably get some interesting results from your first roll, if
you're lucky, and if not, you should still be able to determine whether you
need more or less exposure, or more or less development.

David

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