The M.Zuiko Digital ED 40-150mm f/2.8 PRO from Olympus is a versatile 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 range to suit working in a variety of lighting conditions. One aspherical ED (extra-low dispersion) element, two aspherical elements, one Super ED element, three ED elements, and one HD element are featured within the optical design to minimize both spherical and chromatic aberrations, distortion, and color fringing throughout the zoom range while also contributing to overall image sharpness, clarity, and color accuracy. A ZERO (Zuiko Extra-low Reflection Optical) coating has been applied to individual elements to minimize lens flare and ghosting for improved contrast and color fidelity when working in strong lighting conditions. A Dual VCM (voice coil motor) system is used for quick and near silent autofocus performance. By separating the focusing mechanism into two groups controlled by separate linear AF motors, focus speeds are faster and the friction-free movement is notably quieter to benefit video recording. A manual focus clutch permits quick 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 improved balance and support when working atop a tripod or monopod. Rounded nine-blade diaphragm produces a smooth bokeh quality. It is Compatible with the optional M.Zuiko Digital MC-14 1.4x Teleconverter to further extend the reach to a 112-420mm equivalent focal length range. Included lens hood collapses back onto the lens for a more compact profile when stored.