It has a protruding front element so be careful which lenses you try to fit to it in order to avoid damage!
I think you have a facility to 'lock out' the 50mm end of the Bigma in order to use this and the 2x convertors without mishap but do check on other lenses - test the zoom and focussing over the entire range whilst looking at the back of the lens to see how close the rear element comes to the back of the lens.
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