Tamron has officially announced the Tamron 17-28mm f/2.8 Di III RXD E/FE mount lens, with an RRP of £899, and a release date of late July 2019.
From Tamron: Tamron’s NEW 17-28mm F/2.8 Di III RXD lens for Sony FE, full frame mirrorless cameras. An extremely compact and lightweight, fast aperture, ultra wide-angle zoom.
Tamron’s new 17-28mm F/2.8 Di III RXD (Model A046) lens for Sony Mirrorless full frame cameras achieves all of the benefits of a fast F/2.8 aperture in an ultra wide-angle zoom lens, but with an amazingly compact and lightweight design at just 420g and with an overall length of just 99mm. This compact size provides excellent balance and is easy to carry especially with no barrel extension whilst focusing or zooming, making it great for travelling.
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https://www.ephotozine.com/article/tamron-17-28mm-f-2-8-di-iii-rxd–a046–fe-official-uk-price-33717