Tokina 12-28mm f/4.0 AT-X Pro DX Lens for Nikon in Stock June 29, 2013 By Eric Reagan The new Tokina 12-28mm f/4.0 AT-X Pro DX lens is now shipping for Nikon DX DSLRs (like the D7100). Check it out here at B&H Photo. It’s expected to start shipping in Canon mount next month.