Overview

The OM System 100-400mm F5.0-6.3 IS II is a compact, lightweight telephoto zoom (equivalent to 200-800mm) ideal for wildlife and action photographers. Optically, it retains the same design as the original, offering good but not top-tier sharpness. Its key upgrade is Sync IS, boosting stabilization to up to 7 stops, and enhanced weather sealing (IPX1 dust/splash resistant). Build quality is solid with a smooth zoom, Arca-Swiss compatible tripod foot, and compatibility with teleconverters. However, it is larger and heavier than its Panasonic counterpart, and its slow maximum aperture may require high ISOs. It suits users prioritizing reach and portability over absolute optical performance.