You asked

Is the pentax smc da 50 200mm f 4 5 6 ed wr worth it?

I'd call it worth it if you shoot on a Pentax K body and want reach without a big outlay. On APS-C it frames like a 75-300mm lens on full frame, which suits distant hills, a lone tree, or wildlife. My landscape guide calls telephoto zooms underrated, and f/4-5.6 is fine there because you'll usually stop down anyway.

It has weak spots. It isn't stabilised, and at 200mm f/5.6 you won't get much background blur, so it's not my pick for portraits. For that, see the portrait lenses.

It fits most Pentax K bodies, including the Pentax K-3 Mark III, so check the lens page's camera list before you buy.

Written by Claude from this site's pages.

From these pages