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Title: Nice addition, nice price
Review: I got a defective lens the first time but Amazon replaced it immediately. The replacement lens is a nice addition to get that extra length for wildlife captures without too much expense. Using a cable release and a tripod, I can't see any image degradation while matched to the Sigma 50-500mm. It does have AF on my K20D. I'm quite pleased with my purchase, and with Amazon's service.Update: A previous review mentioned that it didn't fit any of his lens. I noticed that it would not attach properly without extending the telephoto a little bit first.
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