Archived posting to the Leica Users Group, 2002/06/21

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Subject: [Leica] Re: Correct Infra Red Film Exposure Setting
From: Allan Wafkowski <allan@sohogurus.net>
Date: Sat, 22 Jun 2002 00:14:17 -0400

The film's technical data sheet states that the film speed without a 
filter is ISO 32, and the film used with a red or orange filter should 
be exposed at f/5.6 at 1/60 in normal sunny conditions. EI 400 is way 
too fast.

Allan


  On Friday, June 21, 2002, at 11:20 PM, Greg J. Lorenzo wrote:
> I've never photographed with IR film but I bought some Konica IR750 to 
> try out.
>
> Konica rates film speed at 32 ISO for this film without use of a 
> filter. But what is the correct ISO setting when using a Wratten #25 
> Red Filter with a M6TTL camera?
>
> I assume that the meter sees more light than it thinks it sees and that 
> I should rate the exposure at about 400 ISO?
>
> TIA for any recommendations.
>
> Regards,
>
> Greg
>
>
>
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