Review: Tamron 70-210mm f4 Di VC USD (Canon EF)

When testing the Tamron 70-210mm f4 Di VC USD, I had a whole lot of hope. The company's lenses have been stellar and they've been winning many awards. But when it came to working with this lens, things were just off. The quality of the optics is fantastic as always. But where I saw issues was with performance--not only on the Canon 6D Mk II but with a Sony a7r III and a Metabones adapter. It could do the job, but with varying success that other lenses of similar types and focal lengths could do....