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A Tamron 2x or a Kenko 2x or 1.4x will work with the lens as far as I can remember, however you lose 1 stop of light with a 1.4 and 2 stops with a 2x, so the autofocus wont work with any converter with that lens. To get AF on a 2x you need an f2.8 lens and an f4 with a 1.4x.
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