The canon ef 600mm f4l is ii usm is a high magnification super telephoto lens featuring integrated image stabilizer technology and a fast f4 maximum aperture it features a lightweight magnesium alloy and titanium construction which reduces weight without compromising on strength and build quality while its optical design includes fluorite and ud lens elements to tackle aberrations and distortions in addition canons patented subwavelength structure coating helps minimise ghosting and fl