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Message: <blockquote data-quote="mike from ebbw" data-source="post: 1820898" data-attributes="member: 38123">Hi Simon.Be aware though that you will lose some quality when using a teleconverter and stay away from the 2x as the quality will really suffer.I use the Kenko pro 1.4x with my Sigma 50-500mm and get some pretty decent results.You wont be able to autofocus and will have to do it manually.This sounds easy enough but modern autofocus lenses snap in and out of focus so quickly it is easy to get it wrong.Using a smallish aperture can help and gives you a bit more depth of field to play with but of course then you need the light.Well worth getting one though.Both these shots were taken with this set up to give some idea of the picture quality.Hope this helps.</blockquote>