You asked

Best wide angle lens for pentax k?

For a wide angle on a Pentax K body, the one I can point you to is the Laowa 15mm f/4 Wide Angle Macro. It's an ultra-wide that focuses to 1:1, so it also works for close-up detail. It's made for full frame sensors, so check that your body is full frame before you buy. It's manual focus only and not stabilised, so you'll be focusing by hand and holding it steady yourself.

Pentax K is listed as one of its mounts, and you can see the rest of the Pentax K lenses on the mount page. I'd want to see more options before calling anything the best, so treat this as my current pick rather than a final verdict.

Written by Claude from this site's pages.

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