Size (diameter x length): At 74 x 117mm (2.9 x 4.6in.) plus 28mm for the lens hood (which is 87mm in diameter) the new Tamron is a pretty small lens, even a bit slimmer than the Sony at 81 x 118mm (3.2 x 4.7in) + 36mm lens hood. As usual I’ve rated the features with a (or ), when it’s better than average or even state of the art, a if it’s standard or just average, and if there’s a disadvantage. PS – if you’re interested in the other full-frame zoom lenses for E-mount in Tamron’s line-up check out my in-depth reviews: Tamron 17-28mm f2.8 Di III RXD review / Tamron 28-75mm f2.8 Di III RXD review / Tamron 70-180mm f2.8 Di III VXD. The Nikon may look like an odd choice in this comparison but Tamron has announced that they are working on Z- and RF-mount versions of their lenses. In my tests I compared the new Tamron 28-200mm f2.8-5.6 Di III to the alternative from Sony – and the equally new Nikon Z 24-200mm f4.0-6.3 VR. The new Tamron has no optical stabilization and relies solely on the image stabilization provided by the Sony Alpha mirrorless cameras while the Sony FE 24-240mm f3.5-6.3 OSS has optical image stabilization. lighter than the alternative from Sony, the FE 24-240mm f3.5-6.3 OSS, and both lenses extend while zooming. Physically, the 28-200mm f2.8-5.6 Di III is a little smaller and 200g / 7 oz. Announced in June 2020, it is a more affordable and lightweight alternative to carrying Tamron’s 28-75mm f2.8 Di III plus 70-180mm f2.8 Di III zoom lenses although you lose-out on a constant f2.8 focal ratio – and some image quality. The Tamron 28-200mm f2.8-5.6 Di III RXD (model A071) is an all-in-one zoom designed for Sony’s Alpha mirrorless cameras and corrected for full-frame sensors. Tamron 28-200mm f2.8-5.6 Di III RXD review The shorter range is arguably the biggest factor to weigh-up, but if you don’t need to zoom as wide as 24mm, Tamron has designed a compelling super-zoom which clearly earns a Highly Recommended! Buy it now! Check prices on the Tamron 28-200mm f2.8-5.6 Di III at Amazon, B&H, Adorama or WEX! Alternatively get yourself a copy of my In Camera book or treat me to a coffee! Thanks! On the downside, the wide end starts at 28mm versus 24mm on rivals, it has no optical image stabilization, and there were some strange autofocus-misses which might be a problem with my copy of the lens - but worried me nonetheless. But most importantly its optical performance is very convincing, astonishingly so for a 7.1x zoom lens. But the Tamron offers a brighter focal ratio of f2.8 at the wide end, achieves a magnification of 1:3 from 0.19m, and is weather-sealed. At the time of writing, it was only available in Sony E-mount, and costs more in some regions than Sony’s own FE 24-240mm super-zoom, while lacking its broader zoom range and optical stabilization. Summary The Tamron 28-200mm f2.8-5.6 Di III is a small and light all-in-one zoom designed for mirrorless cameras with full-frame sensors.