Tamron announced it was developing a 17-28mm f/2.8 Di III RXD lens for Sony users back in February, but only now has it made specs and pricing official.
The lens, officially christened the Tamron 17-28mm F/2.8 Di III RXD (Model A046), is described by its manufacturer as being “astonishingly small” for a full-frame, large-aperture, ultra-wide-angle zoom. That’s in part thanks to to it having a 67mm diameter filter thread, despite offering an f/2.8 aperture through the entire (albeit modest) zoom range.
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https://www.techradar.com/news/tamron-17-28mm-f28-di-iii-rxd-model-a046-confirmed-for-sony-bodies
