You asked
Best camera for the pentax smc da 16 50mm f 2 8 ed al if sdm?
This lens is made for APS-C, so I'd start with an APS-C body. My pick is the Pentax K-3 Mark III. It's a natural partner for this zoom, and it handles the 16-50mm range as it's meant to be used.
If you want something smaller, the Pentax KP also takes this lens with no fuss. It's a sensible choice if you're carrying the kit around all day.
If you already own a Pentax K-1 Mark II, the lens still works. It runs in APS-C crop mode there, at fewer megapixels, so you lose some of the full-frame resolution you bought the body for.
For landscapes, this zoom is a fine wide-to-standard option. See the landscape guide for how it fits with other lenses.
Written by Claude from this site's pages.