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Message: <blockquote data-quote="Tord" data-source="post: 2162860" data-attributes="member: 40738">Hi allHere is an update on this thread. I have been using a EC14 with the 50-200 SWD, with some mixed results. I believe the main drawback (except from losing 1EV) is that the AF performance is impacted. What I mean is that when photographing birds in flight, zoom fully extended, quite often the AF will fail in locking and end up in the close range, and there it will give up. That almost never happened when using the lens without the teleconverter. The workaround is to lock the AF with shorter zoom (perhaps 100?) where the AF usually will find the target fast, and then zoom in. I should perhaps also mention I use AF-C and all 7 AF points on my E620 when taking pictures of birds in flight. Anyone else experienced this behavior?/Tord</blockquote>