You asked
Best travel lens for the olympus om d e m1?
For the E-M1, I'd start with the Olympus M.Zuiko 12-45mm f/4 PRO. It covers 24-90mm in full-frame terms, which handles most travel scenes, and it's a pro-line lens that suits the E-M1's build.
If you'd rather change lenses less, the Olympus M.Zuiko 12-100mm f/4 IS PRO goes from wide to 200mm equivalent, and its stabilisation helps in dim churches and markets. It's a bigger lens, so weigh it against your bag before you commit.
For evenings and food, add a small fast prime. The Olympus M.Zuiko 25mm f/1.8 (50mm equivalent) is the one I'd pack. See what to pack for the rest of the kit, and what matters for how to weigh size against range.
Written by Claude from this site's pages.