Manufacturer Description The ZUIKO DIGITAL ED 50-200mm f2.8-3.5 SWD is a high-performance super-telescopic zoom lens, which for the first time the SWD (Supersonic Wave Drive) autofocus system and covers a zoom range in height from 100 to 200 mm on a 35-mm camera objective. ED lenses are used intensively to the color blurring that can occur when long lenses are extended to their maximum focal length to correct, while the dedicated digital high-definition provides design —