You asked
Best travel lens for the fujifilm x t50?
For travel on the X-T50, I'd start with the Fujifilm XF 16-80mm f/4 R OIS WR. It covers roughly 24-120mm in full-frame terms, which handles most travel pictures, and it's weather sealed.
If you want a faster aperture for dim interiors, the Tamron 17-70mm f/2.8 Di III-A VC RXD is my pick. It's bright and stabilised. For more reach, the Fujifilm XF 18-135mm f/3.5-5.6 R LM OIS WR goes out to about 202mm equivalent.
Then add one small fast prime for evenings and food, as the travel guide suggests. The Fujifilm XF 23mm f/2 R WR works well here, at about 34mm full frame.
Written by Claude from this site's pages.