Pentax DA* 16-50mm lens

The DA* 16–50mm lens is a family of professional wide-angle lenses made by Ricoh Imaging. The current version, the HD DA* 16-50mm f/2.8L ED PLM AW, replaced the older smc DA* 16-50mm f/2.8 ED IF SDM lens in 2021.

smc DA* 16-50mm F2.8 ED AL (IF) SDM
The Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM is an advanced standard zoom lens for Pentax K-mount APS-C DSLR bodies, announced by Pentax on February 21, 2007.

HD DA* 16-50mm F2.8 ED PLM AW
The Pentax smc DA* 16-50mm F2.8 ED AL (IF) SDM is a professional standard zoom lens for Pentax K-mount APS-C DSLR bodies. Development was announced on 25th May 2020, officially product name announced on October 25, 2021, launched on July 15, 2021 and first shipped in August 2021.