The 70-210 f4 has the screw type focus, and it focused fast enough for daughter's gymnastic. The motor in the body is pretty fast. As fast as the 35mm f1.8 AF-S that I have. However, the gearing in the lens may slow it down. On kenrockwell's site, the old 80-210 f2.8d was geared to focused slow, but the newer one focus fast, so beware which one you get.