This year marks the 40th anniversary of Tamron’s SP lens line. To celebrate, they’ve introduced a prime lens that represents the culmination of the design and technology skills they’ve amassed in over four decades of lens making. That lens is the SP 35mm f/1.4 Di USD for Canon and Nikon full-frame DSLRs. It’s a stacked lens, with the second generation of Tamron’s Broad-Band Anti-Reflection coating (BBAR-G2) to minimize flare and ghosting. Autofocusing is driven by Tamron’s Ultrasonic Silent Drive with a newly-developed Dynamic Rolling-cam mechanism which improves performance and reliability when working in extreme temperatures.