A few months ago Viltrox announced three new lenses coming to the Sony and Fujifilm APS-C system. Now Tokina is releasing similar lenses. Sometimes Tokina and Viltrox share similar optical formulas but they don't always produce identical results in terms of performance in IQ. You'll likely see people call these Tokina lenses re-badged Viltrox lenses but there is a lot more to lens design than just the optical formulas. Coatings, build quality and focusing technology all can have a huge impact on lens performance and even the image quality.