Tamron announced two zoom lens updates at this year’s WPPI show in Las Vegas – the full-frame SP 70-200mm F2.8 Di VC USD G2 and the APS-C format 10-24mm F3.5-4.5 Di II VC HLD. Technically, both are ‘updates’ to older products, but the improvements are fairly significant. This is the 70-200mm F2.8, mounted on a Canon EOS 5D Mark II.

The ‘G2’ 70-200mm F2.8 now carries the ‘SP’ designation, which Tamron reserves for its highest-end lenses. The lens has been completely redesigned, and the new optical design consists of 23 elements in 17 groups. These include extra low dispersion and low dispersion elements to reduce chromatic aberrations.

Mechanically, there have been some changes too. Like Nikon’s new 70-200mm F2.8E, the Tamron 70-200mm F2.8’s zoom ring can be found near the front of the lens, while the focus ring is positioned closer to the camera. Feel free to argue about whether this is a good idea or not in the comments. Minimum focus distance is unequivocally improved, being reduced to 95cm (37.4″) from the previous model’s 130cm (50.7″).
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https://www.dpreview.com/articles/5491090479/hands-on-with-tamron-70-200mm-f2-8-and-10-24mm-f3-5-4-5-g2-zooms