If David Mecey switched to Tamron/Sigma, it's only because they paid him 6 figures to do it. There *is* a dufference in the quality of the glass from Nikon/Canon vs the "others". Look on the used market and get a real lens, from Nikon/Canon. They are always there...they maintain their value...and they are flat out better peices of glass than the other stuff.
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