Using Cokin 89B infrared filter

I'm going to try Kodak High Speed Infrared Film with Cokin 89B filter

Cos I'm new to infrared photography, I dont know how to expose the

film..

what iso/asa? and how to calculate exposures regarding to apperture)

Can I use camera lightmeter or not?

Hope you will be able to help me..

I rate HIE @ 100 for partly sunny days and @ 200 for sunny days. You will

need to determine the filter factor for the 89b. I usually use a red #25 for HIE

and add 3 stops exposure. You might need to focus and check your cameras

meter with the filter off, add the filter and adjust exposure accordingly.

The IR effect depends on how much visible light you filter out. Without any filter HIE looks very much like a regular b&w film. If you are using a #25 or 29 red filter, you can set your camera to ISO 320 and meter through the lens. Bracketing is advised because the film has different looks for different exposures. Here is a page with a ton of info:<br>

<a href="http://www.cocam.co.uk/CoCamWS/Infrared/INFRARED.HTM">http://www.cocam.co.uk/CoCamWS/Infrared/INFRARED.HTM</a>

I use a #29 deep red for shooting HEI, and rarte it @ 320 or 400. I meter and focus through the filter. Do not adjust the focus when using the red filters. However, with the opaque IR filter's, you will want to adjust the focus. I believe that the filter factor for most of the opaque filters is about 5 stops?

Russ<div></div>

Kodak recommend 1/60 @ f/8 (or equivalent, EV12) for an 89B in good sunlight with this film. I've found this to be a little conservative, at their recommended development of 8.5min in D76. I'd recommend EV13 as a good starting point, assuming open sunlight. I don't bother with a meter for infra-red work. The sun is a fairly constant light source, so exposure varies very little! Open up a stop or two in open shade or within an hour of sunset/sunrise and you'll not go far wrong.

You might find my web-page http://user.itl.net/~kypfer/infra_red.htm of use.