Tamron has announced the 70-300mm f4.5-6.3 Di III RXD telephoto zoom lens for Sony e-mount will be available from October 29 for $1000.
The 70-300mm f4.5-6.3 is Tamron’s first telephoto zoom lens developed for full-frame mirrorless cameras. It will be the smallest and lightest of its kind currently available for Sony Alpha cameras, weighing just 545 grams.
The AF drive system includes a sensor that detecs the position of the lens, while an ‘exceptionally quiet’ RXD (Rapid eXtra-silent stepping Drive) motor delivers optmised AF control. This achieves fast and accurate autofocus operation and allows users to maintain tack-sharp focus on continuously moving subjects shot at the telephoto focal lengths.
The optical design includes 15 elements in 10 groups, with an LD (Low Dispersion) lens element arranged to suppress axial chromatic and other aberrations that are likely to happen with telephoto zoom lenses. At 300mm, a commonly used telephoto zoom focal length, the design delivers high resolution from edge-to-edge of the frame. Tamron has also included its BBAR (Broad-Band Anti-Reflection) Coating to reduce reflections.
The lens has a moisture resistant construction, with seals located at the lens mount and other critical locations to prevent moisture from entering the body. Read the press release here.