Constant f2.8 maximum aperture Focal length: 12 to 40 millimeter, minimum focus distance 7.87 inches (20 centimeter ) Drip proof; Dustproof, splash proof, and freeze proof construction. Lens construction: 14 elements in 9 groups (Aspherical ED lens, 2 Aspherical lenses, DSA lens, 2 ED lenses, HD lens, 2 HR lense) Includes lens hood and pouch, filter size 62 millimeter, equipped with manual focus clutch mechanism Compatible with Olympus and Panasonic cameras This large-aperture 3.3X zoom lens is the first in the newly created ?M.ZUIKO PRO? category. Covering a 35mm equivalent focal length of 24-80mm, this lens features all metallic construction and makes extensive use of high grade optical components including dual aspherical, high refractive and ED lens elements configured in 9 groups to assure the highest level of reproduction. A fast maximum aperture of f2.8 throughout the zoom range, a manual focus clutch as well as Splash-proof, Dust-proof and Freeze-proof construction make it suitable for the most demanding professionals and enthusiasts. An ?MSC? (movie and still compatible) AF lens drive system ensures fast and quiet auto-focusing - especially important when shooting HD movies. A seven blade circular aperture produces pleasing background defocusing effects. Included accessories are LH-66 petal type hood, LC-62D aluminum protective lens cap, LR-2 rear lens cap, LSC 0918 lens pouch and one year world-wide warranty.