Re: How to calculate depth of field?

[Ben Kreunen <ben@xxxxxxxxxxxxxxxxxxxxxxx>]

At 11:56 PM 7/3/00 +0200, you wrote:
>Jason Revell wrote:
>
> > however it states that in most cases use 0.036mm for 35mm film and 0.056mm
> > for 120 roll film.
>
>I allways believed that C is related to the film resolution, so it
>should not be the same with Kodachrome 25 and Kodak HIE : you don't
>need the same accuracy with a very fine grain film and a monstruosly
>grainy film, allthough you can see some difference even with a grainy
>film... so i used to take 0.02 mm for Kodachrome and 0.05 for HIE in
>35 mm _and_ roll film

That's right... all you're saying is that your film type is changing what 
you define as being in focus.... with very grainy films it can be hard to 
tell the difference. I tested a 16mm lens with Techpan and printed a 
portion of a 20x30" print.... no grain, no focus either...  I sold the 
lens  ;-)

Cheers

Ben

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