Canon EF 100 mm f/2.8 L Macro IS USM
7. Coma and astigmatism
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The coma correction in the tested lens is exemplary. It’s influence on the picture quality is minimal and, what’s more important, it is true for APS-C corner and for full frame corner too. The crops below show it perfectly.
Astigmatism, like coma, is imperceptible. On the APS-C sensor the average difference between vertical and horizontal MTF50 function values amounted to only 4.0% and 4.9% on the full frame sensor. Both these results are low and our lens assessment in this category is as positive as it can be.
