Hands on: Very well-finished in satin black, this lens is average in weight and surprisingly compact for a 20mm f/2.8. The reasonably wide, ribbed, rubberized manual-focusing ring turns very smoothly with a well-damped action. Distance scales under a Plexiglas window are smallish but legible (feet in yellow and meters in white-on-black). The adjacent depth-of-field scale includes an IR-focusing index, but only covers apertures of f/5.6 and f/11. The aperture ring has detents at whole-stop intervals, large, legible numerals, and a tab to lock the aperture at f/22 when using program- or shutterpriority autoexposure.