Are we adjusting tracking sensivity or tracking speed here ?
I thought this is for adjusting the amount of time it takes for the focus to move off the target if something passes in front or you loose track. Or does it actually adjust how fast you're lens focuses ?
It also changes how fast the lens focuses if the object you are shooting is moving at a high rate of speed and your relative distance to the object means your chances of losing the prime target area can fall away.
If I am shooting super slow... I dumb it down a bit to slow so the camera doesn't second guess me. If I am shooting a 3/4 pan like I did in the F1 car shot where the car is coming at me at 140+ mph and up a hill where I only have a fraction of a second to react with the shutter button, I have it set to fast so the focus will instantly track to that target and hit it. My experience this past weekend proved that the focus speed adjustment works WONDERS on capturing the object when the least amount of time possible is available to do so. I tried it on both the 7D and the 1DmkIV ... and in both situations the faster focus worked on 3/4 & better angles coming at me or going away.
This Corvette was HONKIN under the bridge...
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