Tamron's popular APS-C constant f/2.8 zoom for mirrorless — 25.5-105mm equiv with VC and compact design.
The Tamron 17-70mm f/2.8 Di III-A VC RXD was released approximately 2021 as a constant f/2.8 standard zoom for Sony E-mount APS-C, covering 25-105mm full-frame equivalent. Eighteen elements in 13 groups. Seven aperture blades. 67mm filter thread. At 525g. 0.19m MFD. VC vibration compensation. RXD stepping motor.
Eighteen elements in 13 groups (3 LD + 1 aspherical elements). Seven aperture blades. The 67mm filter thread. At 525g. Minimum focus distance of 0.19m. VC (Vibration Compensation) optical stabilisation. RXD stepping motor for fast, quiet AF. f/2.8 constant aperture. Di III-A APS-C mirrorless native. Sony E mount.
The Di III-A designation confirms APS-C mirrorless native design for Sony E: Di III-A is Tamron's mirrorless APS-C designation. The 25-105mm equivalent range is broader than the standard 24-70mm, extending to 105mm telephoto. The 0.19m MFD at the wide end enables close foreground compositions. VC provides stabilisation on Sony bodies without IBIS.
On the used market the Tamron 17-70mm f/2.8 Di III-A VC RXD is affordable as an APS-C f/2.8 standard zoom for Sony E. Condition checks: RXD AF response, VC engagement, 67mm front element for marks. APS-C only. Compatible with Sony E-mount APS-C bodies (A6xxx series).