Pentax's updated premium APS-C f/2.8 zoom — PLM AF motor and all-weather construction.
The Pentax HD DA* 16-50mm f/2.8 ED PLM AW was released in 2020 as the Star-series constant f/2.8 standard zoom for Pentax K-mount APS-C with PLM (Pulse Motor) AF, replacing the older SDM version (2007). Sixteen elements in 10 groups with 4 aspherical elements. Nine rounded aperture blades. 77mm filter thread. At 712g. 0.30m MFD. AW (All Weather) sealing.
Sixteen elements in 10 groups (4 aspherical elements). Nine rounded aperture blades. The 77mm filter thread. At 712g the lens is moderate. Minimum focus distance of 0.30m. PLM (Pulse Motor) for faster, quieter AF than the older SDM version. AW (All Weather) sealing — 95 weather seals. f/2.8 constant aperture. APS-C image circle. Pentax K-mount (KAF4).
The PLM motor upgrade over the 2007 SDM version provides improved AF speed and reliability: the PLM mechanism drives the focus group more directly for faster response. The AW sealing (95 seals) provides comprehensive weather protection for outdoor use. The DA★ Star designation indicates Pentax's premium optical and build-quality tier.
On the used market the Pentax HD DA★ 16-50mm f/2.8 ED PLM AW is available at Pentax premium standard zoom pricing. Condition checks: PLM AF response, AW sealing, 77mm front element for marks, zoom ring smoothness. APS-C only. Compatible with Pentax K-mount APS-C bodies.