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Most of my thru the fence shooting is of a/c on the move, and I predominantly use back button focus. How would your technique help me with this?
Mark, I use back button focus too. For shooting up in the sky, not sure it would apply, but it may apply to an aircraft taxiiing behind some fencing you are standing near. With long lenses I am sure you know the depth of field can be very shallow. You can literally be right up behind some chain link fencing, or trees with leaves, and pan right through them, or at times, even shoot a still and the lens won't even pick up the chain link. I like to do this with no autofocusing enabled and by pre-focusing on a spot on the track and then essentially turning AF off. The below example is through foliage much denser than what appears in the frame (I wanted some edging of the leaves here) and had a bunch right in front of the lens that don't even appear. This shot is out of camera and not dolled up at all, just something that was close to what I was describing. Again, I wanting some leaves in this for effect. Apologies if most already know this...just thought a casual walker by on the thread could learn something.
Happy Thanksgiving for those in the USA.