michael_burin1

<p>I had both a 1Ds (mk1) and 7d at one point, and thought AF was generally better on the 1Ds. I was mostly using<br> an older, non-usm lens though, a 50/1.8 (mk1); maybe it's different with more modern lenses. There's a difference<br> between a faster AF motor/mechanism (but perhaps doesn't lock on as often) and AF that is slower, but more sure.<br> Suppose you need both fast and sure for birds in flight! </p>