We managed to get our hands on a pre-production sample of the new Sony FE 600mm f/4 GM OSS, the company’s latest addition to its G Master lens line, as well as a Sony A9 running Sony’s latest version 5 firmware.

In our brief time with the lens we were able to shoot a game of polo, and wildlife at a nature reserve, to see how it performed when faced with different subjects.
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https://www.techradar.com/reviews/sony-fe-600mm-f4-gm-oss-review