LensTip.com

Lens review

Sigma 70 mm f/2.8 EX DG Macro

18 April 2012
Arkadiusz Olech

4. Image resolution

The resolution test of the Sigma 2.8/70 was based on RAW files from the Canon EOS 20D reflex camera. Let’s remind here that in its case the decency level is situated at 30 lpmm and the best fixed-focal lenses can get as high as 44-46 lpmm.

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.

Sigma 70 mm f/2.8 EX DG Macro - Image resolution



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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.

Sigma 70 mm f/2.8 EX DG Macro - Image resolution