Adam Maas wrote:
Sylwester Pietrzyk wrote:
Toralf Lund wrote on 04.10.05 10:06:
USM is not faster, at least until you have very long lens with
heavy optics. [ ... ]
Ring-type in-lens motors (USM/AF-S Ring-type) are faster, in all but
the lightest lenses. You can easily verify this with a Nikon body like
the D70 or F80, by switching between say a 28-105 (Body-driven) and a
24-120 AF-S.
I don't think you can prove anything general about the types of motors
that way.
If I were to hazard a guess about the in-body motors used by Nikon, it
would say that both of these bodies have a cheap and not very capable
one - and that the D2X would focus the above mentioned lens faster.
- T
