The new 17-28mm f/2.8 Di III RXD (Model A046) is a large aperture, ultra wide-angle lens for Sony E- mount full-frame mirrorless cameras. Model A046 features a filter diameter of 67mm (astonishingly small for a full-frame, large aperture, ultra wide-angle zoom lens) as well as an unprecedented light weight of 14.8 oz. and diminutive length of 3.9 in. The compact size provides excellent balance on the small profile mirrorless cameras and is easy to carry. The lens offers a large f/2.8 aperture throughout the entire zoom range and delivers high-resolution and contrast edge-to-edge. The combination of ultra-wide-angle focal length, large constant f/2.8 aperture and an MOD (Minimum Object Distance) of 7.5 in. at the wide-angle end encourages richly expressive and creative photography in a multitude of scenarios.