Here is some additional information on the new Tamron 70-300mm f/4.5-6.3 Di III RXD mirrorless lens for Nikon Z-mount from the B&H Photo product listings:
Tamron 70-300mm f/4.5-6.3 Di III RXD mirrorless lens key features:
“With a dynamic telephoto zoom range and compact profile, the 70-300mm f/4.5-6.3 Di III RXD Lens for Nikon Z from Tamron provides a popular telephoto zoom range for the full-frame Nikon Z-mount mirrorless cameras. This lens spans a useful short- to long-telephoto range and measures just 5.8″ in length with a maximum diameter of 3″, and it weighs just 1.2 pounds. It offers optical performance with aberration correction that delivers high image quality. Tamron’s RXD stepping motor unit provides high-speed, high-precision, and quiet operation and takes full advantage of in-camera features including Sony’s Fast Hybrid AF and Eye AF functions. The 70-300mm f/4.5-6.3 is a highly practical telephoto zoom lens that performs across a diverse range of shooting styles including sports and other athletic events, wildlife, portraits, and more.”
More information on the Sony version of the lens can be found here – here are the MTF charts and lens design diagram:
