That's odd! I just tried that with my 1n and BP-E1. Used the 28-135, took the battery rack out of the BP, put it back in, got the same noise you describe. It didn't matter that the IS was off, or even if the camera was off. This last is really strange. Put on a 50mm f1.8, nothing. 100 f2, nothing. 100-400 IS, still nothing. Very strange. It only seems to happen with the 28-135 IS Skip Middleton http://www.shadowcatcherimagery.com
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