Focal Length: 50-200mm Aperture Range: f/2.8-4.0 to f/22 Micro Four Thirds Lens Mount Power Optical Image Stabilizer Compensates for Hand Shake Ultra-Telephoto Zoom Lens Professional, High-Quality LEICA DG ELMARIT Optics 21 Elements in 15 Groups (2 UED Elements) 67mm Lens Filter Threads Nano Surface Coating Reduces Flare and Ghosting Works in Tandem with LUMIX Cameras Supporting Dual I.S.