Look at this, from yesterday’s pic:
The Canon 7D can direct other flashes with its popup – unique for Canon, and that is what I was doing in this portrait (the main flash is a 430EX with a Honl reflector).
But when you do this, even when you turn the popup flash off (it only commands the other flashes), there’s a tiny residual glow! Every time. That is the little white dot.
Tip: cover it with your hand when shooting (or use Photoshop).