A long-reaching super telephoto for Micro Four Thirds mirrorless cameras, the M.Zuiko Digital ED 300mm f/4 IS PRO from Olympus is a 600mm equivalent lens that balances refined optics with a hand-holdable design. Super ED, E-HR, and HR glass elements are combined to control both chromatic and spherical aberrations to provide a high degree of clarity and sharpness, and a Z Coating Nano has been applied to individual elements to suppress lens flare and ghosting for high contrast, color-accurate imaging. Complementing the optical attributes, this lens is also characterized by its optical image stabilization system, which can be used in conjunction with camera-based sensor-shift IS to realize a six-stop effective reduction in the appearance of camera shake for sharper handheld shooting. A Movie & Still Compatible (MSC) autofocus system is also employed to realize quick and quiet focusing performance, and a manual focus clutch enables seamless switching between focusing methods for more intuitive use. The lens is also fitted with a removable rotating tripod collar for improved balance and support, and the lens is weather-sealed to guard against dust, moisture, and freezing temperatures to benefit working in harsh climates.