Tamron SP AF 70-200 mm f/2.8 Di LD (IF) MACRO
7. Coma and astigmatism
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As you see from the crops below, presenting the diode picture in the frame centre and in the corner, the coma level in the Tamron is low. The distortions, connected with that aberration were a bit bigger for the Sigma, tested not so long ago. Once again, the Tamron is able to reach the level of the good L lenses and the Nikkor 70-200 mm VR.
The astigmatism was a problem in the new version of the Sigma, because its average value was as much as 14.3%. The Tamron fares significantly better here because, in its case, the value, measured by us, amounted to 6%. Even working with a converter, which deteriorates the result in most of cases, the situation is still good because the astigmatism level is only 9%.
