You asked
Best travel lens for the pentax k 30?
The Pentax K-30 has in-body stabilisation, so you can shoot dim interiors handheld. For a one-lens travel kit, I'd start with the Pentax HD DA 16-85mm f/3.5-5.6 ED DC WR. It covers roughly 24-128mm in full-frame terms and is weather sealed, which helps on a wet day out.
If you want more reach, the [Pentax smc DA 18-135mm f/3.5-5.6 ED AL [IF] DC WR](/gear/lenses/pentax-smc-da-18-135mm-f-3-5-5-6-ed-al-if-dc-wr/) goes to about 202mm equivalent and is also weather sealed.
For the small fast prime I'd pack for evenings and food, the Pentax HD DA 35mm f/2.8 Macro Limited works well, at roughly 52mm equivalent. The travel guide has the rest of the kit.
Written by Claude from this site's pages.