| http://www.w3.org/ns/prov#value | - do not get me wrong, I personally have used many third party lenses (mostly Sigma ... in fact there was a point in time when I had more Sigma lenses than any other maker's) and I still have 2 third party lenses (Sigma 150-500 OS & Tamron 24-70 f/2.8 VC) but I found & continue to see that the equivalent Canon lens work better with a Canon Camera than any third party lens I used or have.
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