Originally posted by Saaby If you're on a tripod, however, shake should be effectively 0, so the shake introduced by having the CCD suspended is greater than the shake if the system is off (And the CCD is locked in place).
The only way of taking a picture on the tripod, with SR on, is to release the shutter with your finger, in non-delayed mode.
All the delayed modes, and all cable release modes turn SR off whether you have the switch set to on or not.
The amount of shake introduced by your finger, during a manual shutter release, is substantial, and much more than this hypothetical electro-magnetism-induced non-zero shake.
I did a careful investigation into SR on a tripod, some time ago, and concluded that having SR on was no worse than having SR off,
if you release the shutter with your finger.
What has also been shown quite convincingly, is that with SR on, taking the picture before you get the little 'hand' icon in the viewfinder, ie before SR has stabilised, gives results that are much worse that having SR off.