I think the question comes down to how do you meter at the film plane in a camera with a meter designed to measure light falling on the subject. That question is answered with the light meter calibration formula that has these variables:
Originally Posted by polyglot
b = Constant with units of lx⋅cd–1⋅m2
θ = Angle between subject and lens axis
N = Relative aperture (f-number) of lens
F = Lens flare correction factor
f = Focal length of lens in m
V = Lens vignetting factor
Ls = Luminance of subject in cd⋅m–2
T = Lens transmittance factor
u = Subject distance in m
However, if your flash meter can read directly in Lux-second then it takes out all the above variables and that is all you need.
Personally, I 'calibrate' my sensitometer with some known film, like Ilford D100. There is a precedent in the literature on using film for this type of calibration.
Also, did you see the lengthy discussion about Bill's EG&G sensitometer and how he was able to check it with a flashmeter?
Last edited by ic-racer; 10-30-2012 at 07:34 AM. Click to view previous post history.