You asked

Best telephoto lens for the sony fx2?

For most people, I'd start with the Sony FE 70-200mm f/2.8 GM OSS II. It's a fast telephoto zoom that suits portraits, events and sport, and it's the one I'd reach for first on the FX2.

If you need more reach for distant subjects, I'd look at the Sony FE 200-600mm f/5.6-6.3 G OSS. It's slower at the long end, but it gets you much closer to wildlife without carrying a huge lens.

For serious reach with a fast maximum aperture, the Sigma 300-600mm f/4 DG OS Sports is the one to consider. It's big and heavy, so only pick it if you'll really use that focal range.

For more on choosing by subject, see wildlife and sport.

Written by Claude from this site's pages.

From these pages