Olympus has launched the M.Zuiko Digital ED 300mm F4 IS Pro, which it claims it the sharpest lens in its lineup. The 600mm equivalent prime lens features built-in IS that also works in conjunction with the OM-D E-M1 and E-M5 II bodies to offer 6 stops of stabilization, measured to CIPA standards - the best we've yet encountered. Olympus says it expects the lens to be used for bird photography, landscape and sports. The lens is now available for around $2500.
The 300mm F4 IS Pro includes the pull-back manual focus clutch system used on recent high-end Olympus lenses to give a traditional manual focusing experience. It also includes a retractable hood like the one found on the M.Zuiko Digital 50-150 F2.8 IS Pro. There's also a rotating tripod collar but, since Olympus believes the stabilization and relative light weight of the lens allows it, it also comes bundled with a cosmetic ring that replaces the tripod mount for handheld use.