Macro John
TPF Noob!
I have a Sigma 70-300 Macro APO DG Zoom lens mounted on A Canon 70D, which converter will work on this set up so the auto focus works ?
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Teleconverters are generally best suited for fast, quality prime lenses - they usually don't play well with cheap variable-aperture zooms. If your standards aren't very high, you may do okay with a 1.4X teleconverter, at least on the wider end of the lens. At the longer end, it may not autofocus well. For best results, you really cannot beat a quality prime telephoto lens. Check the second-hand retailers - KEH, MPB, B&H, etc. - for the best prices.I have a Sigma 70-300 Macro APO DG Zoom lens mounted on A Canon 70D, which converter will work on this set up so the auto focus works ?