You asked

Best camera for the sony fe 400mm f 2 8 gm oss?

This is a big, heavy lens, so I'd pair it with a full-frame body. For sport and birds, my pick is the Sony a9 III or the Sony a1 II, both aimed at fast action. If you want a more sensible everyday body that still handles it well, the Sony a7 IV is the one I'd reach for first.

If the weight worries you, an APS-C body like the Sony a6700 gives roughly 600mm full-frame equivalent in a smaller package. For how focal length works out, read reach in wildlife and sport, and see my picks there for more ideas.

Written by Claude from this site's pages.

From these pages