Adam Maas wrote:

>Your meter is calibrated for approximately 12.5% grey (ISO
>standard). 

I believe it's ANSI standard "ANSI PH3.49-1971" As far as I know it
hasn't been made into an ISO standard. Did I miss it?

>Cards are calibrated to 18% grey (Kodak's choice at Ansel
>Adams suggestion). Thus grey cards do not actually function as
>described but rather cause a slight overexposure .

Kodak, at least, provides instructions with their 18% gray card that
you should meter off the card and then dial in 1/3-to-1/2 stop
underexposure.



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