You asked
Best travel lens for the panasonic lumix s5d?
For travel on the S5D, I'd start with the Panasonic Lumix S 24-105mm f/4 Macro OIS. It covers wide to short telephoto, which is the one-zoom job my travel guide describes, and its optical stabilisation helps with dim interiors.
If you want something smaller, the Panasonic Lumix S 20-60mm f/3.5-5.6 is a compact wide-to-standard zoom that stays out of the way in a bag. For evenings and food, pair either zoom with the Panasonic Lumix S 35mm f/1.8.
My pick is the 24-105mm. Take the zoom and the small prime, and leave the tripod at home unless you're shooting night or landscapes.
Written by Claude from this site's pages.