12-03-2009, 01:12 AM
Just for the record, this lens is USM but it's not the better type of USM so it's a little slower*. Still a great lens but it can't quite keep up with something like an 85/1.8.
(* The huge and massively expensive 50/1.0 USM and 85/1.2 USM are butt slow. The 50/1.4 USM is only a little slow.)
I paid the price for that slower AF on this touchdown where it couldn't quite keep up. The picture still works but the focus is back towards his legs.
http://www.post-gazette.com/pg/09326/101...sports.xml
http://www.theonlycolors.com/photos/mult...e-2/410041
But it was a night game so the 24-105/f4 I usually use in that situation was too slow (aperture not AF speed).
(* The huge and massively expensive 50/1.0 USM and 85/1.2 USM are butt slow. The 50/1.4 USM is only a little slow.)
I paid the price for that slower AF on this touchdown where it couldn't quite keep up. The picture still works but the focus is back towards his legs.
http://www.post-gazette.com/pg/09326/101...sports.xml
http://www.theonlycolors.com/photos/mult...e-2/410041
But it was a night game so the 24-105/f4 I usually use in that situation was too slow (aperture not AF speed).