I suspect it\'s not that special but may have been checked for any strong colour absorbtion - some plastics will absorb certain colour frequencies. Many people use plastic bottles of varying types for diffusers.
You can check both for colour absorbtion and light loss by taking a series of photos with the flash in manual and use a series of different flash durations (eg 1/64,1/32/,1/16, 1/8 both with and without the diffuser. By comparing shots with equal exposure you can work out the light loss (normally between 1 and 2 stops) and by comparing the colour histograms you should be able to see if they have been changed significantly.
Brian V.
Nov 05, 2009 at 02:42 AM
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