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They appear to be totally different optical formulas. The SP AF 28-75mm f/2.8 XR Di LD has 16 elements in 14 groups The 28-75mm f/2.8 Di III RXD has 15 elements in 12 groups Although they are both the same diameter and use the same filter size, the newer shorter registration lens is 25.9mm longer. The difference in the registration distance between the E-...


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The camera used to test a lens affects image quality. The exact same lens can be moved from one body to another with very different results. The Digital Picture prefers to use Canon bodies, but Tamron makes lenses for multiple camera mounts. Reviews from multiple sources, using different bodies and copies of the lens, are likely to report different results. ...


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Now we know that Tamron may have autofocus issues right out of the box, and may require tweaking via the tap-in console... The-Digital-Picture does their lens tests using careful manual focus, so AF performance does not affect the image quality samples at TDP. How much coffee Bryan has had before testing a lens might! The real users on the Internet, on ...


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They may have had a bad copy of the lens. Consider, for example, the Canon EF 35mm f/2 non-IS non-USM lens. TheDigitalPicture says this. Whereas, DxOMark says this (see field map at f/2.8). According to TDP, the 35mm lens is crap in the corners even at f/2.8. According to DxOMark, it's quite a good lens assuming you stop down to f/2.8. Obligatory links: ...


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