The Panasonic LUMIX G Vario 100-300mm F4.0-5.6 II is an image-stabilised telephoto zoom for the Micro Four Thirds system (35mm camera equivalent: 200-600mm). Construction comprises 17 elements in 12 groups, including an ED (extra low-dispersion) element. Seven blades give the aperture a rounded shape that produces an attractively smooth effect in out-of-focus areas when shooting at larger aperture settings. It incorporates Panasonic's updated Power O.I.S. system to work with Dual IS and Dual IS 2-equipped cameras, and a new micro-step drive system in the aperture control section for smooth iris actuation. The lens also features faster AF for advanced DFD systems, and is splash, dust, and freeze proof down to -10?.