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The Canon EF 1635mm f/28L III USM adds to the lineup with the latest optics and some other goodies thrown in for good measure Here we will see if this version can outperform the rest Design Like all lenses from Canon's L lineup, the Canon EF 1635mm f/28L III USM is built to last and includes the best opticsThey say this, "The EF 16–35mm f/28L III USM features both Subwavelength Coatings (SWC) and Air Sphere Coatings (ASC) on its lens elements to help combat reflections, flare and ghosting, and deliver clean images with reduced aberrations from reflected light Subwavelength Coatings help prevent reflections by arranging an array of wedgeshaped nanostructures on the lens's surface that are smaller than the wavelength of visible light and are able to help control reflection and flareCanon EF 1635mm F28L III USM Lenses with builtin focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor 5 Canon Ef 16 35mm F 2