Hi Andy, I've no experience of the Nikkor one, but did use a Russian 'copy' for a while. Bit of a monster. I couldn't help thinking it wouldve been nice to have a wider field spotting lens on the hotshoe to try and track objects a little better. I didnt use it enough really to get the best from it, but mirrors are certainly a love 'em or hate 'em type thing. I think they're great, Sigma did a 600mm f4 one for a short while. I always fancied a bright mirror lens, but they're extremely rare....I never found one before the novelty and money for one was spent.
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