• With 1 FLD ("F" Low Dispersion) glass boasting the same performance as fluorite and 3 SLD (Special Low Dispersion) glass to minimize chromatic aberration. The magnification chromatic aberration is especially visible on the telephoto side and does not improve when squeezed, and is focused on adapting power placement such as the use of special low-dispersion glass. High portability throughout the zoom range • Equipped with an ultrasonic motor HSM (Hyper Sonic Motor) for faster AF speed and silent. In addition, we have greatly revised the drive algorithm from previous models • Features include simple dustproof and splash-proof construction, zoom lock by focal length indicator, water repellent and stain resistant coating, MF switching switch at hand, and a newly designed tripod sign • Canon EF Mount • 150-600mm F5-6.3