In article ,
Nick Zentena wrote:

Phil Lamerton wrote:
I'd like to photograph a gray card outside on an overcast day, in
order to do some zone system testing with my new camera and lenses.

Since I will eventually be using the camera in the portrait studio
with a yellow/green filter, would it be wrong to do the testing with
the filter over the lens?


Are you doing a film speed test? If you intend to use the filter nothing
wrong with testing with the filter on. It'll give you a more accurate result.

Nick

I agree,....its the best method for absolute testing.
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