With slide film (low and medium speed) you need only 5 to 7 stops for going
from white to black (5 stops is referred to Velvia, 25 'chrome and 64 T).
Since light will reflect in geometric progression (that is square root of
lenght between source and background) it is easy to do with a curved white
or light gray surface; you get a circular fading with one lamp and a linear
fading with a bank. With negs you have to add at least 2 stops more, much
more if you use 400 ISO onwards.
Marco
----------
>Da: sebastien@xxxxxxxxxxxxxxxxxxx (Sebastien Roy)
>A: olympus@xxxxxxxxxxxxxxx
>Oggetto: [OM] Black to white graduated background
>Data: Mer, 31 mar 1999 2:03
>
> Does anyone know how to create the "white smoothly becoming black"
> background used in photography of ceramic art pieces?
>
> A typical example of this is at
> http://www.ceramicsmonthly.org/images/months/apr99/Pascoe.jpg
>
> Is it a lighting effect? Or a graduated background carboard?
> If it is a cardboard... Any ideas where one can get such a thing?
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