The Panasonic 45-200mm f/4-5.6 G Vario MEGA O.I.S. Lens is an interchangeable long telephoto zoom lens, developed by Leica exclusively for Panasonic Lumix digital micro four-thirds cameras. It follows the ultra-compact Micro Four Thirds Standard, which also makes it compatible with other brands that use this same format. The focal length of this lens is equivalent to approximately 90-400mm in 35mm format terms.