The Canon EF-S 15-85mm f/3.5-5.6 IS USM is a versatile standard zoom lens designed for Canon APS-C DSLR cameras. With a focal length equivalent of 24-136mm in 35mm format, this lens covers everything from wide-angle landscapes to short telephoto composition, making it an excellent general-purpose option. The optical image stabiliser provides 4 stops of compensation for sharper handheld shooting, whilst the ring-type ultrasonic motor (USM) autofocus system delivers fast, quiet focusing with full-time manual override. Built with ultra-low dispersion glass and aspherical elements for superior optical quality, this compact 575g lens has earned a reputation as a dependable workhorse for everyday photography across a range of subjects and conditions.