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I've used the 7D in continuous rain, unprotected. It just keeps working, almost. After a several hours or so, the rear joystick can start playing up but after drying out it is fine again.
I haven't done the same (yet) with the 5D2. It is definitely less sealed than the 7D, perhaps more around the 50D level.
The 24-105 and 17-40 lenses should be a lot better sealed. I've used the unsealed 100-400L in rain, and moisture eventually does get inside after a while, but again it dries out easily. So personally I'd worry more about the 5D2 body than those lenses.
_________________ Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS 3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13 Tinies: Sony HX9V.
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