The APO-Summicron-SL 28 f/2 ASPH. is the latest addition to the ever-expanding APO-Summicron-SL series. Following the existing focal lengths of 35, 50, 75 and 90mm, the APO-Summicron-SL 28 f/2 ASPH. is the first true wide-angle lens in this series. Fast wide-angle lens with f/2 aperture Excellent optical performance Extremely fast and reliable autofocus with Dual Synchro Drive Close-focusing down to 0.24m Same dimensions and filter size as all APO-Summicron-SL lenses