I have shot professionally for the NCAA for years now and have experience with the Nikon 105 and 85mm macro lenses. Canon L series are also phenomenal glass. I would not go with Tamron or Sigma from previous experience with lots of their glass. Their focus motors are louder, take longer to focus, and the glass is not as sharp. Price is always a consideration, but for me I have always loved the Nikon 105mm f/ 2.8.
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