This is the Tokina AT-X 12-28 PRO DX (12-28mm F/4) lens, successor to the AT-X 124 PRO DX II:
Sample photos
Digital Camera Watch (Japanese): Full-resolution photos taken with a Nikon D7100.
Accessories and add-ons
The filter thread size on the Tokina 12-28 77mm, which means you’ll want to be looking at purchasing 77mm filters.
The Tokina BH-77A lens hood fits this lens.
Resources
Official Tokina AT-X 100 PRO D Macro Lens pages at Kenko Tokina Co. and Kenko Tokina USA — reduced-size sample photos are available there.
Read the March 27, 2013 press release.
Related
Tokina Lenses — Main page.