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I sometimes get this behavior also. Although I've never nailed it down to anything repeatable. I just thought it was a result of shooting in bright daylight and not having the number of exposures necessary to make ML happy.

I'll be watching this thread to get an answer to this issue, too.

Weell, I'm not sure but I would think the speed of the shots can't be any faster than the time the shutter must stay open. If you go shoot in bright daylight you'll hear the 60D take fast(er) shots because the shutter speed is faster. However I do know what you're talking about compared to the cameras I talked about earlier - my 60D is very much slower.

Have you tried shooting 3 brackets with Canon built in AEB and then shooting 3 with ML to see if ML really is taking the shots at a slower rate?

Thanks for the reply, but I don't think it is a buffer issue, as I can get 11-13 RAW shots into the buffer with no problem.  The issue is that I want ML to use what Canon calls "High-speed Continuous" shooting (5.3 FPS) when doing HDR bracketing.  ML seems to use the "Low-speed Continuous" (3 FPS) mode.

I recently went thru this same "want/need" after shooting with friends with faster Nikon's and Canon 1D's - I have a 60D.

It seems that the buffer in the prosumer Nikon(s)  allows for faster shooting. The cameras will hold more shots in the buffer and write them later. The same goes for the Canon 1D(x).

One way you can take faster shots with the 60D is to use a higher ISO. This will introduce grain or noise onto your shots. Another solution is allow ML to change the ISO as it takes the shots - this could lead to strange focus issues if you're lens is shooting at anything less than infinity.

HTH