Ultra wide-angle zoom lens Large aperture of F35 throughout the zoom range Super Multi-Layer lens coating HSM (Hyper Sonic Motor) for fast silent AF Ultra wide-angle zoom lens with a large constant aperture of F35 designed specifically for digital SLR cameras This Ultra wide-angle zoom lens has a maximum aperture of F35 throughout the entire zoom range making it suitable for low-light & indoor photography It’s wide-angle of view from 1024 degrees produces striking images with exaggerated perspective enabling photographers to emphasise the subject ELD (Extraordinary Low Dispersion) glass SLD (Special Low Dispersion) glass & Aspherical lenses provide excellent correction of all types of aberrations The Super Multi-Layer lens coating reduces flare & ghosting & creates high image quality throughout the entire zoom range The HSM (Hyper Sonic Motor) ensures fast & quiet autofocus while allowing full-time manual focus override Ultra wide-angle zoom from 1024 degrees The 10-20mm F35 EX DC HSM lens offers photographers greater freedom of expression by rotating the zoom ring It is a very powerful tool for architectural indoor & landscape photography The angle of view changes depending on which camera model the lens is attached to Exaggerated perspective This ultra wide-angle lens allows photographers to create an exaggerated perspective between the subject & the background to emphasise for example expanses of a landscape Large F35 aperture through the entire zoom range The large constant aperture of F35 provides a bright image in the viewfinder which helps photographers easily check focusing & composition Superior image quality One SLD (Special Low Dispersion) & two ELD (Extraordinary Low Dispersion) glass elements are employed for effective compensation of colour aberration The use of two glass mold & two hybrid aspherical lenses offer excellent correction for distortion & astigmatism & ensure superior image quality The Super Multi-Layer coating reduces flare & ghosting & provides high contrast images throughout the entire zoom range Quiet & fast AF