Archived posting to the Leica Users Group, 2002/04/08

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Subject: Re: [Leica] ISO setting for Fuji 800 NPZ professional
From: Photo Phreak <leicam4pro@yahoo.com>
Date: Mon, 8 Apr 2002 11:10:33 -0700 (PDT)

- --- Dan Cardish <dcardish@sympatico.ca> wrote:
> This is the information I'm looking for.  In the past
> whenever I've used
> colour negatives films with speeds greater than 400, I've
> always found that
> the rated speeds were always an overestimate.
> 
> But you find that NPZ can really be rated at the
> "official" rating?
> 
> Dan C.
- ------------------------------------------------------------

    Before blindly accepting someone else's rating, please
consider the variables involved.

1.  Every camera is slightly different.
    a.  Shutter speed variances
    b. meter calibration variances
    c. lens aperture variances 
       ( a 1/3 stop error is considered "normal" and 
        acceptable )
2.  Every photographer composes and meters a little
    differently.

    So my suggestion is start with the manufacturer's
rating and then experiment with future rolls until you find
the value you think is correct for your work.

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