airfins
Senior Member
if instability is due to tripod, you might want try to weigh it down, say with your camera bag... that can help to stabilize the tripod...
of course, non-sharpness might be due to other variables, like using the 2x extender will reduce sharpness of the setup...(does the Canon 70-200 need to switch off IS for tripod use? no experience here... for Nikon 70-200 VR its recommended if tripod and head is locked down...)
I have tried both with IS on and off, same result...should have tried weighting the tripod down with my bag. Could be due to the 2X too.