Spanning a flexible range of telephoto focal lengths, the EF 70-300mm f/4-5.6L IS USM is a Canon L-series lens characterized by its relatively compact size and versatility. Two ultra-low dispersion elements are used to greatly reduce color fringing and chromatic aberrations throughout the zoom range for high clarity and color accuracy, and a Super Spectra coating has also been applied to suppress flare and ghosting for improved contrast. Also, a floating elements mechanism is employed to maintain consistent image quality throughout the focusing range for notable sharpness from 3.9' to infinity.