Presuming you are using a good strong tripod and head that won't shake when you tap the lens gently, I can only suggest using a cable release just in case pressing on the shutter release button is causing vibration... You are of course switching the IS off on the 70-200 when the camera is tripod mounted... Pro wildlife photographers have been using the MKI for years without problems so unless you have a bad copy there should be no problems...
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My opinions are exactly that, they may not be yours, they may not always be right, they definitely aren't the only way to do things, they are merely my opinions...
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