One of the zoom trinity lens favoured by photographers across genres, RF15-35mm f/2.8L IS USM has made a leap forward in its design--made possible with RF mount. Going 1mm wider comparing to EF16-35mm f/2.8L USM III, but increasing angle-of-view by 4°. Designed to provide up to 5 shutter speed stops of Image Stabilisation that ensures sharp images in dimly lit situations. Edge to edge clarity detail across the focal length, whether for the majestic landscape or that casual snapshot on your travel. Unique to RF lenses, the additional control ring on the barrel of EF16-35mm f/2.8L USM III that could be customised to control exposure settings; providing a more intuitive control especially while shooting.