[ad_1] Tamron Announces 70-300mm f/4.5-6.3 Di III RXD Full-Frame Lens for Sony E-Mount Today, Tamron has announced its latest full-frame E-mount lens, the 70-300mm f/4.5-6.3 Di III RXD. Not only is it quite thrifty at $549, it’s also the smallest and lightest telephoto zoom lens available for the Sony mount. Measuring in at 5.80 inches in length with a 3.03 maximum diameter, the new 70-300mm weighs just 1.2 pounds. Like the other Tamron full-frame mirrorless lenses, it has a 67mm filter […]