With a 25mm focal length and 47 degree angle of view, the Olympus M.ZUIKO AF Digital 25mm f/1.8 Lens sits right between wide and telephoto designs, making it a great choice as an all-around lens for your photography. A fast f/1.8 circular aperture delivers beautifully soft defocused backgrounds for impressive portraits or when subject emphasis is the desired photographic effect. An inner focusing mechanism assures fast and accurate auto-focusing, and because it is an MSC design, it offers nearly silent focusing operation a great feature when shooting HD movies.Zuiko Digital 25mm f/1.8 is a thin, lightweight single-focus standard pancake-type lens. The lens has an overall length of 23.5 mm. The total length including the camera body and lens is only 76.5 mm. The result is an easy-to-store, easy-to-carry camera system with go-anywhere portability.With a focal distance equivalent to 50 mm on a 35 mm film camera lens, this standard pancake-type lens provides an image angle very close to that of the naked eye. The result is a near-natural visual field that makes this an ideal standard lens for daily use, whether for simple snapshots or for more sophisticated portrait and landscape shooting.Directly compatible with E-System cameras. Compatible with Micro Four Thirds digital cameras (PENOM-D) through use of the MMF-2 or MMF-3 (Four Thirds Lens Adapter to Micro Four Thirds Lens Adapter). The MMF-3 is dust and splash proof for use with that type of lens on a dust and splash proof body.Features: Equivalent to 50 mm in 35mm formatThree aspherical lens elementsNearly silent High-speed Imager AF MSC (Movie/Still Compatible) lens driveReduced weight (4.8 oz)46 mm filter size