Best wide angle lens for the pentax k 3 mark iii?

For the K-3 Mark III, I'd start with the Pentax HD DA* 11-18mm f/2.8 ED DC AW. It frames like 16-27mm on full frame and its f/2.8 aperture is rare at this focal range, so it's my pick for low light and interiors.

If you want more reach, the Tamron SP AF 10-24mm f/3.5-4.5 Di II LD Aspherical (IF) goes wider, covering 15-36mm equivalent, for landscapes and tight rooms.

For something smaller, the Pentax HD DA 15mm f/4 ED AL Limited is a compact prime that's a joy to carry all day. If you're after landscapes in particular, the landscape guide explains how focal length shapes a scene.

Written by Claude from this site's pages.