Offering long reach with an latested feature-set and optical design, the M.Zuiko Digital ED 40-150mm f/2.8 PRO from Olympus is a flexible 80-300mm equivalent telephoto zoom for Micro Four Thirds mirrorless cameras. As part of the PRO series of advanced lenses, this zoom distinguishes itself with a bright f/2.8 constant maximum aperture for consistent illumination throughout the zoom reach to suit working in a variety of lighting conditions. Its optical design makes use of a series of aspherical and low dispersion glass elements to suppress chromatic and spherical aberrations for notable sharpness and lucidity, and a ZERO coating is also used to reduce flare and ghosting for high contrast, color-accurate imaging. Complementing the optics, a dual VCM autofocus system offers fast and near-silent focusing perform to suit both stills and movie recording applications. A manual focus clutch permits fast switching between AF and MF, and a programmable L-Fn button avails lens-based control over shooting settings. The lens is also weather-sealed for working in trying conditions, and a removable rotating tripod collar is included for developed balance and support when working atop a tripod or monopod.