Tamron has announced the development of a new telephoto zoom lens for Sony E-mount full-frame mirrorless cameras, the 70-300mm f/4.5-6.3 Di III RXD (Model A047). The lens is scheduled to launch towards the end of 2020. While Tamron has manufactured a number of telephoto zoom lenses that extend to 300mm for D-SLR cameras, the new 70-300mm f/4.5-6.3 is reportedly, the world’s smallest and lightest 70-300mm zoom lens, measuring 14.7cm, 544g and a maximum diameter of 77mm.
Its moisture-resistant construction provides greater protection when shooting outdoors and the lens shares the 67mm filter diameter common to all members of Tamron’s lens series for full-frame mirrorless cameras. The 70-300mm also features an AF drive system that is powered by Tamron’s RXD stepping motor unit for providing high-speed, high-precision and quiet operation. No pricing related information has been shared by the company so far, but, the press release suggests that the specifications, appearance and functionality of the lens may undergo further changes.