Best wide angle lens for the pentax k s1?

For the Pentax K-S1, my first pick is the Pentax HD DA* 11-18mm f/2.8 ED DC AW. It's a fast zoom that stays bright across its whole range, and on this APS-C body it frames like 16-27mm on full frame.

If you want something smaller, the [Pentax smc DA 14mm f/2.8 ED [IF]](/gear/lenses/pentax-smc-da-14mm-f-2-8-ed-if/) is a simple wide prime. It frames like 21mm on full frame.

For the widest view, the Tamron SP AF 10-24mm f/3.5-4.5 Di II LD Aspherical (IF) covers 15-36mm equivalent, though it's slower at the long end.

Not sure how the numbers convert? The focal length converter will work them out for you.

Written by Claude from this site's pages.