The lens is somewhat large for its class (in fact, its weight and dimensions are almost identical to Canon's fixedaperture 16-35mm f/2.8), and finished in Sigma's newly improved EX surface, which eliminates tiny gold and silver flecks that looked like dust in some photos of previous EX lenses. The new surface is still slightly textured, but now it's a uniformly sleek matte black. Focusing, depth-of-field, and zoom scales are in white and easily legible. Zoom and focusing rings are amply large and covered with a ribbed, rubberized material. The manual-focus ring turns smoothly and evenly, with a pleasing drag, but the zoom action grows stiffer as you rack the lens out. Unlike most zooms, this lens' focusing collar is significantly wider than its zoom -- a feature manual-focus fans should applaud.