Originally posted by pentax user I got this one second hand, the guy sold me this said no full time manual override
In manual mode, body mf, lens mf, it's not as freely rotate as pentax 17-70
but a bit more like manual focus old lens with a bit friction . Is this the case in your copies?
Yes, the focus is dampened nicely (like on old MF lenses) when in MF, not loose at all.
I think the PF review and B&H are just parroting the Sigma press release, which obviously is wrong (at least for Nikon and Pentax mounts).
From the
Photozone review of the 17-70 "C" Nikon mount
...the lens still features a simplified version of Sigma's HSM (hypersonic AF motor), which is fast and nearly silent, but does not allow full-time manual (FTM) override in single-shot AF mode. To focus manually, the lens needs to be set to the corresponding mode with the usual A/M switch on the lens barrel.