…primes, while Tamron will mix much better with higher contrast lenses like Pentax SMC, Zeiss Contax, Canon FD and even some modern lenses, so it’s impossible to pick a winner in this category. Which one to choose will depend on what other lenses you are planning to use it with. Built Quality & Usability: Both lenses are super solid because they are made fully out of metal. Both have very nice, smooth focusing rings with very similar focus throw, b… Continue Reading