Quote:
Originally Posted by bloodhound31
G'day Dennis. They are diffused, I have thick tissue paper over both flashes heads, but I'll take a look at it.
Thanks for the pointer. 
Baz.
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Hi Baz
I’m assuming stuff here, but if the diffusing material is the same size as the flash heads, that is, the material is just stuck on the front of the original flash head diffusers/covers, then you won’t really gain any noticeable improvement in terms of softer shadows.
To make the shadows softer, you need to increase the (apparent) surface area of the light source, so the add-on diffusers should be at least 2 to 3 times the size of the flash head(s), although they shouldn’t block the escape of heat from the flash discharge otherwise the heads will melt.
On my 580EX II I noticed a big improvement when using a Lumiquest soft box which has a surface area at least 4 to 5 times greater than the naked flash head, making the apparent light source much larger. An analogy is comparing the harsh shadows from the Sun on a clear day with the soft lighting on a cloudy day, where the clouds effectively diffuse the light from the Sun’s disc over a much larger area.
Cheers
Dennis