The Panasonic Leica DG Vario-Elmarit 50-200mm f/2.8-4 ASPH. POWER O.I.S. Lens is a flexible optic ideal for wildlife, outdoor, and nature photography. It is a 100-400mm equivalent zoom designed in collaboration with Leica for Micro Four Thirds cameras. The long reach is complemented by a bright f/2.8-4 maximum aperture range, which benefits working in low-light conditions and also affords control over depth of field for isolating subjects. The optical design incorporates several low dispersion elements, two aspherical elements, and an ultra-high refractive index element to control both chromatic and spherical aberrations for improved clarity and sharpness. A Nano Surface Coating has also been applied to limit flare and ghosting for increased contrast and color fidelity when working in strong lighting conditions.