You asked
Best travel lens for the sony a6400?
For the a6400, I'd start with the **Sony Vario-Tessar T* E 16-70mm f/4 ZA OSS**. It works out to about 24-105mm on full frame, which covers nearly every travel shot with one lens, and it's stabilised, which matters because the a6400 has no in-body stabilisation.
If you want more reach for markets and street details, the Sony E PZ 18-105mm f/4 G OSS gives you roughly 27-158mm in full-frame terms. For even more range in one lens, the Sony E 18-135mm f/3.5-5.6 OSS goes to about 27-202mm, though it's a bit bulkier.
Before you buy, check the travel guide for what to weigh, and use the focal length converter if you want to compare other lenses on the a6400.
Written by Claude from this site's pages.