Kodak Film Speed Questions

["Weaver, Patrick" <PWeaver@xxxxxxxxxxxxxxxxx>]

Hello 

i'm new to the list and have only dabbled in infra-red photography slightly.


I want to know what film speed I should set Kodak B&W High Speed Infrared
Film to. The reason i ask is that i set it as 400 ISO as recommended in a
magazine however when I asked my lab to process it at 400 they said it was
off the scale and should be rated 50 ISO. I am now confused , do I rate it
at 400 and have it processed at another speed?

Also should I use the same ISO setting using a red filter as using a
IR72(HOYA) filter?

I would be greatful for any advice anyone can provide.

thanks
Patrick

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