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Wren, Winterkoning,  Troglodytes troglodytes. | by jwsteffelaar
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Wren, Winterkoning, Troglodytes troglodytes.

I used this friend to test my new combination of Canons 100-400mm mk II lens with extender 1.4 mk III. AF might be an issue with this combination, necessitating micro-adjustment of the settings. I am happy with these results, the more so, because of the enormous effective maximum focus lenght of the combination: 1.6 (crop factor of my camera) x 560 adds up to nearly 900mm.

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Taken on July 27, 2016