You asked
Is the pentax hd da 11 18mm f 2 8 ed dc aw worth buying used?
Yes, I think it's a good candidate for used buying. The Pentax HD DA* 11-18mm f/2.8 ED DC AW is a fast, weather-sealed wide zoom for APS-C, and it's built for Pentax K-mount bodies. It frames like 16-27mm on full frame, so it suits landscapes, architecture and interiors. It has autofocus but no stabilisation, so it's worth checking the body you pair it with.
Since you're buying used, look at a body that's a generation or two old. My guide to buying used explains why that often gives you most of the camera for much less. Pick a body with good in-body stabilisation if you shoot handheld in dim rooms, since this lens doesn't have its own.
Written by Claude from this site's pages.