ScubaBasics
Contributor
I would like to know how strobe manufacturers (Inon & Sea & Sea) calculate and measure the angle of coverage. How far away, light fall off from center to edge (in f stops), flat testing surface or curved?
Strobe Angle of coverage testing
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bvanant
Contributor
The typical test (not by everyone though) is to calculate the angle where there is one f stop fall off, using a planar white surface. What I do in the pool is to shoot the side of the pool wall (which is mostly white but a bit textured) and then use photoshop to figure out where a single stop difference is. If you have money and time and lots of flash meters you could do a better job but this is a complex problem to solve.
Bill
Bill
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