Hi guys! I got myself a cheap flash diffuser (probably a Sto Fen clone) for my 580 EX II. It comes in three colors, white, blue and yellow. This seems to be a newbie question, but how do I use them? Or rather, how do I use them properly? I've read some that it should be positioned to a max of 45 degrees towards the ceiling. What are the strengths and weaknesses of using this diffuser aside from a few light loss?





Thanks!