A constant f/3.5 aperture across the 10-20mm zoom range provides consistent exposure control, supported by 3 ED and 4 aspherical elements to curb distortion. The HSM autofocus motor delivers quiet, fast focusing, while the built-in stabilization aids handheld shooting in tight interiors. This lens is best for APS-C landscape photographers needing an ultra-wide perspective without the bulk, weighing just 520g.
