Does anyone know if what the difference would be on a sd 15mb/s vs a sd 20 or a 30/mbs would be for shooting video on a sx210?
No difference as the 15MB/s is fast enough to max out the camera's capabilities .. assuming you mean 15MB/s and not 15Mbit/s which would be Class 2. In the latter case, I am not sure without looking at the spec sheet for the SX210.
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