You asked
Best travel lens for the sony a7r iii?
For the a7R III, I'd start with the Sony FE 24-105mm f/4 G OSS. It covers wide to short telephoto, which handles most travel pictures with one lens, and it's stabilised, which helps in dim churches and markets.
If you want one lens for everything, the Sony FE 24-240mm f/3.5-6.3 OSS reaches much further, at the cost of a bit more size and less light at the long end. For a lighter bag, the Sony FE 28-60mm f/4-5.6 is a compact everyday zoom.
Pair whichever zoom you pick with a small fast prime for evenings and food, such as the Sony FE 28mm f/2. The a7R III's in-body stabilisation already helps with handheld shots, so you don't need a stabilised lens for that. For the full checklist, see travel.
Written by Claude from this site's pages.