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| p.2 #8 · Do you use IS when on tripod? |
Yes, Canon indicates that super teles are designed that IS can stay on when mounted on tripod or other firm support. I expect this capable of dealing with any perceived movement or vibration of the super tele range.
Canon has also said earlier that IS should be turned off for tripod mounted shorter lenses, as it introduces its own attempt to counter non-existent motions, leading to blurring. I don't know the current status of their IS, especially the hybrid IS, but I still turn off on the two I have (15-85 and 100L) when tripod mounted. In the past, I had seen IS introduced blurring on my 18-55, 28-135 and 55-250, so I'll stick with the safe approach for tripod mounted time exposures and turn off the IS.
I don't have any super teles, but it would be an interesting study to see if there are any ill effects on tripod mounted time exposures, or whether Canon's endorsement only holds true for "live action" shorter exposures. I seriously doubt that IS can be left on for a 10 second and longer exposure with any lens without suffering IS-induced blurring.