Before launching into our comparisons, let’s take a little closer look at how the two versions of the Tamron lens perform:Tamron SP AF 90mm F/2.8 Di MACRO mounted on a Canon EOS 1Ds Mark III and on a Nikon D3X:With a DxOMark overall score of 23 for the Canon mount and 22 for the Nikon, the two 90mm Macros are for all intents and purposes identical.Strong points:Excellent sharpness.No distorsion.Attractive price.Very reasonable weight.Weak points:Vignetting, with a loss of 1EV in the last 1/3 of the field at f/2.8.Noticeable chromatic aberrations in the corners.What might be the best 100mm
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