The Tamron SP 24-70mm f/2.8 Di VC USD excels at the DXO Mark bench: "When mounted on a Canon 5D Mark II, the Tamron SP 24-70mm F2.8 Di VC USD achieves an overall DxOMark Score of 24, the 2nd highest score in our database for a high-speed zoom."

The Tamron SP 24-70mm f/2.8 Di VC USD excels at the DXO Mark bench: "When mounted on a Canon 5D Mark II, the Tamron SP 24-70mm F2.8 Di VC USD achieves an overall DxOMark Score of 24, the 2nd highest score in our database for a high-speed zoom."

So, the Tamron manages to closely match such expensive and optically well endowed lenses as the Canon 24-70mm f2.8L USM II, and the Nikkor 24-70mm G ED, both costing around the 2 grand mark in every major western currency:

"The Tamron SP 24-70mm f/2.8 Di VC USD is in the top three best performing high-speed standard zooms currently available. We’ve only looked at the imaging performance, but it’s as impressive optically as the highly regarded Nikon AF-S Nikkor 24-70mm f2.8G ED. At $1,299 it’s not cheap but it is competitively priced – to improve on the image quality you would have to spend $1,000 for the sublime Canon EF 24-70mm f/2.8 II USM. Dropping down

in price to the Sigma at $899 may be the way to go on a budget, but that lens lacks weatherproofing and can’t match the Tamron optically at all focal lengths, nor can any one of those rivals offer the highly sought after optical image stabilization. For the time being at least it’s a Tamron exclusive feature in this lens type, and that combined with the comparative image quality makes it difficult to ignore.

In our first comparison, with an overall DxOMark Score of 24 the Tamron matches the high-regarded $1,900 Nikon AF-S Nikkor 24-70mm f2.8G ED but can’t quite match the category leader, the optically awesome but costly $2,300 Canon EF 24-70mm f2.8L II USM.

Looking at the Lens Metrics Scores for Transmission, Distortion, Vignetting and Chromatic Aberration it would seem the Tamron should be ahead, but they don’t tell the whole story.

Look at the overall DxOMark Score and the linear scale and gauge behind it. The score is an average result based on the lens performance over the various focal lengths (when tested on a specific camera), and the blue-color gauge shows the range of results. 

If the gauge is wider, or larger, as it is for both the Tamron and Nikon lenses, it means the performance isn’t consistent at each focal length. Notice the narrow range of results for the Canon lens, it's a simply a superb performer throughout the zoom range. In the case of the Tamron, and Nikon in this instance, both lenses show a noticeable loss of sharpness in the mid-to-longer focal lengths, and not only in the centre of the frame but also at the edges and corners."

 

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