Re: Infrared-Digest

[Ben Kreunen <ben@xxxxxxxxxxxxxxxxxxxxxxx>]

At 09:51 PM 11/3/99 -0800, you wrote:
>I shoot Kodak HIE at 200 ASA and develop in D-76 for 11 min. at 68 degrees.
>
>If I use an ASA of 50, 100, or 400, how do I figure out what the development
>times are? Is there some mathematical formula to determine this?   Kodak was
>of no help.  I hope you can offer some advice.   Thanks.

There are guides but no strict mathematical formula since there are other 
factors in your processing that will affect the film speed...

In practise you should determine your film speed from your processing. ie. 
rather than trying to figure out how to process for 400 ASA, simply 
bracket, increase/decrease your processing time by say 30-50% and then see 
which frame gives you the correct exposure. The exposure for that frame 
will give you your film speed for that processing.

 From there you can probably extrapolate/interpolate your results for a 
particular film speed.

Cheers

Ben

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