Tamron will release its 28-200mm f/2.8-5.6 Di III RXD all-in-one zoom lens for Sony E-mount full-frame mirrorless cameras on June 25, 2020.
Tamron’s 28-200mm f/2.8-5.6 Di III RXD (Model A071) lens. (Source: Tamron.)
Only 117 mm in length and weighing 575 grams, the new lens combines a compact size with light weight and an affordable price. It has been developed as an all-in-one zoom for everyday use on a full-frame mirrorless camera and is the first of its type to offer a maximum aperture of f/2.8 at the 28mm wide-angle end of the zoom range. The optical design on this lens contains 18 elements in 14 groups and includes GM (Glass Molded Aspherical), hybrid aspherical, XLD (eXtra Low Dispersion) and LD (Low Dispersion) lens elements, precisely arranged to control chromatic and other aberrations and enable high resolving power. BBAR (Broad-Band Anti-Reflection) Coating provides powerful anti-reflection properties to minimise ghosting and flare.
This diagram shows the positions of the exotic elements in the lens design. (Source: Tamron.)
The new lens is also designed to enable close-up shooting with a MOD (Minimum Object Distance) of 19 cm at 28mm achieving a maximum magnification ratio of 1:3.1, while at 200mm the MOD is 80 cm with a maximum magnification ratio of 1:3.8. Focusing is driven by an exceptionally quiet RXD stepping motor unit. The drive incorporates a sensor that accurately detects the position of the lens while the RXD motor achieves very fast and accurate autofocus operation.
Moisture-resistant seals are located at the lens mount and other critical locations and the front surface of the lens is coated with a protective fluorine compound that has excellent water- and oil-repellant qualities. A handy Zoom Lock switch prevents unwanted barrel extension during transportation. The new lens is compatible with Sony’s Fast AF and Eye AF functions as well as direct manual focus and in-camera lens corrections. It also supports camera-based lens firmware updates.
The RRP of the new lens is AU$1299. Click here for more information.