Vladimir Deryabin
Well-known member
Have you tried using the bare 500 lens?
That 1.7 is not doing the photos any favours and neither is the extreme cropping...reach isn't everything.
From these examples clear that does the extender x1.7:
http://www.deryabino.ru/ptaha/20160823/20160823-17.html
Distance to a bird ~40m.
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