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It probably is compatible, why don't you ask AquaTech directly? I've corresponded with them, and they provide good rsponse.
I have an AquaTech SS-Zoom raincoat for a normal zoom on 1D-series body. It's well made and works fine. OTOH, I prefer the Think Tank Hydrophobia raincoats that sjms mentioned. I have both the 70-200 and 300-600 v.2 models, and they work very well in even the heaviest rain.