I think the answer here is that one has to relax between shots.Late last summer I was perched on my trike for 1 hr trying to take shots of Swallows who were flying overhead.I was holding aloft a 20D plus 100-400 lens.I do have serious joint probs which do affect my shouders and hands.The pain was unbelievable in the evening.I could not even use the pc mouse for several days.So now I try to relax between shots and just hold the camera loosely on my knee.I guess this is where using a tripod comes into its own for heavier lens set ups,but most of the time this is not practical.
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