You asked

Best camera for the olympus m zuiko 150 400mm f 4 5 tc1 25x is pro?

The lens is a Micro Four Thirds zoom, so every camera that fits it is a Micro Four Thirds body. On that sensor it frames like 300-800mm on full frame, which is serious reach.

For serious bird and wildlife work, I'd go with the OM System OM-1 Mark II. If you want something lighter for hiking and travel, the OM System OM-5 Mark II keeps the same lens mount and carries more easily. On a tighter budget, the Olympus OM-D E-M5 Mark III is a sensible everyday body for this lens.

The full list of compatible bodies is on the lens page. For the wider reasoning about reach, see wildlife and sport, and if you're shopping for a body, buying used can save a lot.

Written by Claude from this site's pages.

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