Sony’s new 400mm and 600mm super-telephoto primes make light work of a heavy hobby — here are my favorite wildlife photos I shot with the pair

I've only just had my hands on the Fujifilm XF 400mm F4.5 R OIS LM WR lens , photographing birds of prey in flight, but I can now reveal that I was also testing two rival super-telephoto Sony primes at the same time ahead of their launch; the FE 400mm F4.5 GM OSS and FE 600mm F6.3 GM OSS.

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