A compact, high-magnification zoom lens with few aberrations and effective image stabilisation.The EF 70-300mm f/4.5-5.6 DO IS USM is Canon’s second lens with three-layer type Diffractive Optics (DO). It can be used with both ‘APS-C’ (where it covers angles of view equivalent to 112mm to 480mm) and 35mm-sized image sensors. Using three layers of diffraction gratings enables lens designers to almost completely cancel out chromatic aberration and subdue spherical aberration to a near-negligible point. The resulting lenses are smaller and lighter and can out-perform other zoom lenses with equivalent focal lengths and aperture ranges that use fluorite, ED or aspherical glass elements to controls these aberrations.
