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Guy, I am not quite following. To me, "spot" is a metering mode while "single point AF" is selecting a focus point. I'm still shooting Canon 1d Mk2 and Mk2n bodies so maybe this is some kind of AF feature on newer Canon bodies (or Nikon bodies, of which I am totally unfamiliar with). Can you clarify please?
As far as AF goes, I'm always on single point, with 13-point (if I recall) expansion so I can move that single focus point up/down or left/right when necessary. That's pretty much the case for me regardless of the lens being used.