Lens review
Sigma 70 mm f/2.8 EX DG Macro
4. Image resolution
In this category the tested lens can be only praised. From f/4.0 aperture upwards the image is outstandingly sharp. At the maximum relative aperture the situation is a bit worse which is fully understandable, but still the result we get there should be considered great. By f/2.8 the tested Sigma fares better than such competitors as the Tamron 2.8/90 or the Sigma 2.8/105. In the range from f/4.0 to f/16 the results are a bit higher than those of the Sigma 2.8/105 but also a bit below those of the outstandingly sharp Tamron 2.8/90. On such a high level the differences between these lenses are really slight and you can see or use them only in exceptional, real life situations.
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The situation on the edge of the field is identical. The MTF50 graphs place the tested lens on a quite high level between the Sigma 2.8/105 and the Tamron 2.8/90 apart from the maximum relative aperture where the 2.8/70 fares the best.
To sum up you can’t have even the slightest reservations when it comes to the image quality of the Sigma 2.8/70.
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