You asked
Best camera for the tamron 18 200mm f 3 5 6 3 di iii vc?
The Tamron 18-200mm f/3.5-6.3 Di III VC is an APS-C lens, so I'd pair it with an APS-C Sony E body. My first pick is the Sony a6400. It's small, it's native to the lens's sensor size, and the 18-200mm then frames like roughly 27-300mm full frame, which covers almost everything.
If you want something newer, the Sony a6700 is another APS-C option that fits the lens natively.
If you already own a full-frame body, the Sony a7 IV will take the lens in APS-C crop mode. It works, but you'll get fewer megapixels than a native APS-C body would give you.
The lens itself is discontinued, so check used listings. The full details are on the lens page.
Written by Claude from this site's pages.