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Awful weather today so I played with some different diffuser materials on my coke can. Materials all commonly available in the house.
The amount of diffusion not suprisingly seemed directly related to the light loss. The light loss was estimated by looking at a series of shots taken with the flash in manual (ie 1/64,1/32,1/16,1/8) but the comparison shots are all ETTL.
The target is a raisin with two board pins taken at 1:1,F11, ISO200,1/200th.
I tend to use either kitchen towel or disposable table cloth
click on pic for larger size