Large and heavy, it weighs about 4 ounces more than its predecessor and nearly half a pound more than Sigma's comparable 24mm f/1.8. The stippled, matte-black polycarb barrel sports a new MF/AF switch that we hope Canon puts on other lenses-flush with the barrel, it's less likely to be reset accidentally. When we tested the previous version in 1997, we had trouble reading the subject-distance scale, and that's still true. Otherwise, the lens is a pleasure to use, with a comprehensive depth-of-field scale, an infrared focusing tick, and perfectly damped MF action. Typical of Canon USM lenses, AF is quick, quiet, and accurate. The bayoneting, petal-style lenshood (included) is velvet-flocked.