There are two different teleconverters for the Lumix S Series telephoto zoom lenses - a 1.4x Teleconverter Dmw-STC14 and a 2x Teleconverter Dmw-STC20. They can be attached to the Lumix S Pro 70-200mm F4 O.i.s. (S-R70200), enabling the use of the lens as a super telephoto lens with its extended zoom range of maximum 400mm for Dmw-STC20 with high-speed, high-precision Af. The rugged dust/splash-resistant design withstands use under harsh conditions even in 10 degrees below zero for high mobility. Dust and Splash Resistant does not guarantee that damage will not occur if this lens is subjected to direct contact with dust and water..