Well, I bought one. The first thing I did is shoot a comparison shot. Not a 100% test but at least it shows a comparison. The dish certainly blocks IR focus assist but not 100% like I had expected. I'll post the dish vs. a $16 Sto-Fen diffuser cup, and make another post showing straight vs. bounce.
From one test I think the dish produces better output than a Sto-Fen diffuser cup, but it's up to the user if the dish is worth losing partial focus assist and being $50.
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