A rare old lens that was only in production for a brief period of time, and so far it produces satisfactory results. The filter thread rotates as you focus and the lens extends around 2 centimeters, which is not much; the focus ring is narrow and at the front end of the lens- basically it's part of the front element's casing- so it's not good for MF even though it's not loose, AF is not fast- at lest not on a D70s. However, the zoom ring is large and well built, plus the length of the lens remains unchanged throughout the entire focus length. In terms of performance, it's sharp from f5.6 at 210mm and sharp with even faster aperture at shorter focus length. This lens weighs 760g and uses metal HN-24 hood. I'm quite happy with this lens, actually.