Sigma 85 1.4 and teleconverter?
Is there a 1.4 or 1.5 teleconverter that I can use with my Sigma 85 1.4 and Canon 50D that will allow the lens to opperate "properly" (i know that it will lose light, but i would like for all the other features, such as the autofocus and the aperature to still work automatically). Thanks!
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