Any focus scale is always welcome on a lens. From looking at the photos, however, this one may not turn out to be as useful as such scales are on older manual-focus lenses. That's because the f# marks are very close together, and there are exceptionally few distance values machined into the rotating part of the barrel. I presume that fast autofocus operation mandates that the motors in autofocus lenses like this one need to have a small rotation angle between infinity and closest focus. Thus there's little space on the rotating part of the lens, and its difficult to accurately machine distance values onto it. Older manual-focus lenses had a bigger rotation range and thus the f# markings were farther apart, and there was ample space for more distances to be accurately marked. This lens could turn out to be like the Nikon AIS lenses which have small rotation with some markings, but they are not as useful as the the ones on older AI lenses which have a bigger rotation range and greater separation of the both the f# and the distance markings.