You asked

Best travel lens for the canon eos 5d mark iv?

For the 5D Mark IV, I'd start with the Canon EF 24-105mm f/4L IS II USM. It covers wide to short telephoto, which is most of what you'll shoot on a trip, and the stabilisation helps in dim churches and markets. If you want something cheaper and lighter, the Canon EF 24-105mm f/3.5-5.6 IS STM does the same job with a slower maximum aperture.

The Canon EF 35mm f/2 IS USM is my pick for the small fast prime that travel kits call for. It's good for evenings and food, and it's stabilised too.

Weigh the whole setup before you commit. A big zoom that stays in the hotel is no use to you. The travel guide has more on size and stabilisation, and the Canon EOS 5D Mark IV page lists every EF lens that fits.

Written by Claude from this site's pages.

From these pages