While most of Tamron’s recently-launched lenses have been for Canon and Nikon D-SLRs, the company is planning a 28-75mm f2.8 zoom for the FE mount, scheduled for launch in mid-2018.
The new Di III series lens (Tamron’s designation for lenses for full-35mm mirrorless cameras) employs a new autofocusing drive called ‘RXD’ which stands for Rapid eXtra-Silent Stepping Drive. Stepping motors are becoming more frequently used for autofocusing systems because they’re not only very quiet, but provide the smoothness which is especially important when shooting video. The lens supports Sony’s ‘DMF’ (Direct Manual Focus) function which provides a full-time manual override of the autofocusing. According to Tamron’s preliminary specs, the zoom has a minimum focusing distance of 19 centimetres at 28mm and 39 centimetres at 75mm. It measures 117.8 mm and weighs in at 550 grams.
The FE mount 28-75mm f2.8 Di III RXD zoom (a.k.a. Model A036) features a weather-sealed external construction with a fluorine coating on the exposed surface of the front element to help better repel moisture and grease. The configuration of the optical construction has yet to be revealed. For information about Tamron lenses visit http://www.tamron.com.au