The HD Pentax-DA 20-40mm f2.8-4 ED Limited DC WR is a compact zoom lens for APS-C format Pentax DSLR cameras. The zoom range might seem unusual, but it's a pretty decent wide-to-normal spread, and there's a non-zero probability that it's an obscure homage to the Pentax-110 20-40mm zoom. The zoom ring riffs on Takumar styling, too, so someone at Pentax HQ was probably feeling nostalgic. Clean glass, good function, light cosmetic paint and finish wear.