If my memory serves me right, with the diffuser on, you should have the speedlight pointing up at 60 degrees. I don't believe the i-ttl works with the diffuser, although I may be wrong on that. When you position the flash directly at your subject without the diffuser, then you gain the benifit of the i-ttl and the auto-fill flash. I'd like to see some tests of the two mode, to see if there is a difference in the behavior of the fill, with and without the dome with the speedlight pointed directly at the subject.
-danny
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