How does the first third-party standard zoom for Sony full frame mirrorless cameras shape up? Michael Topham had the privilege to test the first working sample in the UK
Tamron 28-75mm f/2.8 Di III RXD review: Autofocus
Tamron has designed the lens to be compatible with all focus mode and focus area settings on Sony’s latest A7-series cameras. This includes the Direct Manual Focus (DMF) feature that enables Sony users to instantly switch between autofocus and manual focus by rotating the focus ring whilst the shutter button is half depressed.
Side by side testing with the Sony FE 24-70mm f/4 ZA OSS Vario-Tessar Carl Zeiss T* lens demonstrated it’s just as fast at acquiring autofocus on static subjects and is reasonably snappy at keeping apace with moving subjects in continuous AF mode, with only minor hunting observed at longer focal lengths.
The RXD stepping motor unit keeps AF operation very quiet indeed. Most importantly the autofocus operation won’t be heard by those around you when shooting stills and I found the very subtle AF motor noises are barely noticeable on a video soundtrack, even when filming in complete silence.