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. https://www.amazon.ca/Tamron-17-28mm-Mirrorless-Limited-Warranty/dp/B07TP4YM1F/ref=sr_1_2?dchild=1&keywords=tamron+17-70+f2.8+sony+e+mount&qid=1633898582&s=electronics&sr=1-2