The Tamron 17-28mm f / 2.8 Di III RXD Lens is a light, fast wide-angle zoom for Sony E-mount cameras and has the same diameter as the previously released Tamron 28-75mm f / 2.8 Di III RXD, but even shorter and lighter, the lens weighs only 420 grams. The Tamron 17-28mm is a very compact lens: 99mm length, 67mm diameter. The optical design is complex, with 13 elements in 11 groups, including an aspherical element and a number of elements for which glass with a special refractive index has been used. Zooming is nice, easy, the focus ring turns even easier. The diaphragm has 9 rounded blades. This lens has been specially designed for Sony FE mount. Therefore, there is no problem using advanced autofocus capabilities such as Eye-AF or Direct Manual Focus (DMF) on Sony mirrorless cameras. Everything works as it should and the focus is very fast when the aperture is fully open. The Tamron 17-28mm f / 2.8 Di III RXD has the same RXD drive as Tamron's previously released 28-75mm f / 2.8 Di III RXD. Tamron's RXD (Fast Silent Stepper Drive) focusing motor is quiet, fast and accurate. Thus, Tamron's 17-28mm f / 2.8 Di III RXD zoom is suitable for autofocus movie recording. Stepper motors combined with sensor autofocus also guarantee a high degree of accuracy. The shortest autofocus distance at 17mm is 19cm and the maximum magnification is 0.19x, which is very good for wide-angle zoom. The Tamron 17-28mm f / 2.8 Di III RXD lens is very sharp and has a rounded aperture. As a result, the aperture opening remains circular until about f / 5.6. This lens exhibits pretty good bokeh for wide-angle zoom. The Tamron 17-28mm has excellent backlight and glare control, shooting a bright light source at night results in minimal flare and ghosting. Chromatic aberration is also well controlled. Even in an area of high contrast, very little color distortion can be seen, even at 100% magnification. This lens does not have built-in image stabilization, but modern Sony cameras have built-in image stabilization (IBIS), so the need for built-in image stabilization is not so great, especially for short focal length lenses. The Tamron 17-28mm f / 2.8 Di III RXD lens is sharp, fast, lightweight and fast ... all at a very low rental price. Rent this great lens for documentary and group photography, landscape and architecture photography.