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Latest Review Posted Kenko Teleplus Kenko Pz-AF 2X Teleplus MC4
Where to start... I got two on ebay for ~$50 (each, at various times) in the hopes of adding reach while still keeping AF. Well, not so much.

First off, DA* lens won't AF at all. HSM lenses (tried a few) will *try* to focus but will never lock. Screw drive lenses will focus but even a fast 2.8 (now at f/5.6) may focus if it is very bright. I mean burning retina bright.

Also when using screw drive lenses, often some weird non-healty noise was generated.

IQ is pretty bad, it may double the focal length but it screws image quality by 10 folds ... Using my Sigma 35 (in manual focus...) I end up with the IQ of scratched, dirty, misaligned and full of fungus lens.

So in a nut shell, not only it heavily degrades image quality, I'm not even sure it's even safe to use, those grinding/weird noise when paired with a screw drive AF lens are scary.

Save $50 and crop with photoshop, your pictures will look 4 times better any you won't risk damaging your camera/lens.

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