Tamron SP 500mm F/8
Prime / adaptall-2
Zoom / pentax-k / SP
A standard zoom lens for APS-C DSLRs, offering a 17–50mm focal-length range and a bright constant F2.8 aperture. It is designed for the Pentax K mount and belongs to the SP series. This model incorporates optical and design features such as Di II, LD, Aspherical, and IF.