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Fort Pierce, US
"RE: Nikon TCEs"
Hi Wim.To my eye there is less image degredation with the tc20 III than there is with the tc17. I cannot however say that I have done any formal rigorous testing comparing the two.Of course the autofocus with the tc20 III and my long f/4 lenses (200-400, 500, 600) suffers as it is at f/8.I use all three tcs all the time.JIM