You asked
Best budget lens for the pentax k x?
For a budget pick on the Pentax K-x, I'd start with the cheap fast prime the Your first camera guide recommends: the Pentax smc DA 50mm f/1.8. On this body it frames like 75mm, which suits portraits and low light.
If you want one lens for everything, the Pentax smc DA 18-55mm f/3.5-5.6 AL WR covers wide to short telephoto. For a faster zoom, the Tamron SP AF 17-50mm f/2.8 XR Di II LD Aspherical (IF) gives you a bright f/2.8 aperture across a useful range.
I don't list prices, so check current costs before you buy. My advice is to put a good lens ahead of a bigger body.
Written by Claude from this site's pages.