My question is: How long has this been going on? ... (humm it if you
know it...)
Does this partially explain why (for film at least) testing for actual
speed rather than published ISO/ASA is necessary? Yes, I know there are
other factors such as equipment, chemistry, etc. But how much a factor
is this (12%) against those other factors? In any event, it seems to
mandate careful testing and calibration.
Earl
Fernando Gonzalez Gentile wrote:
>on 22/03/2005 21:00, Winsor Crosby at wincros@xxxxxxxxxxx, wrote:
>
>
>
>>http://www.bythom.com/graycards.htm
>>
>>
>Thanks Winsor, I always wondered about this issue -not exactly through the
>histogram path. Now, some light is thrown on this question. Several
>conclusions could be pulled out, some right, some wrong.
>
>Fernando.
>
>
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