The Tamron SP 1.4x convertor is an excellent piece of glass. i have the earlier Adaptall one, way better than the SP 2x convertor.
I have to admit tho, that the High spec 1.5x DOI branded convertor is quicker to use in may case as I don't need to take the cameras adaptall mount off first...This is nearly as good as Tamron's unit.
2x is a different matter...DOI's 2x is a complete waste....which is why I took the elements out and used it as an extension tube! The Tamron SP 2x is the only one I use if a f5.6 max aperture doesn't matter (ie in bright light)
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