Dave Williams
Well-known member
I have never found a need to fine tune any Canon lens, maybe I'm missing out! I never switch the IS off either as on more recent lenses, your instruction book will indicate as much, it can detect when the lens is on a tripod and if you are attempting to hand hold it will be advantageous.The lens might seem monstrous when you first get one but it soon shrinks in size and panning BIF should be possible once you have had a little practice and some weight training.
If you are making big crops perhaps the problem is atmospheric distortion caused by the heat.
If you are making big crops perhaps the problem is atmospheric distortion caused by the heat.