Tamron AF 55-200 mm f/4-5.6 Di II LD Macro
7. Coma and astigmatism
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In this chapter we will going criticize first and praise later. The correction of the coma is not sufficient. The worst situation we see in the 55-130 mm range but at 200 mm it gets significantly better.
When it comes to astigmatism, though, the Tamron 55-200 mm reached one of better results among all lenses we’ve tested so far. The average difference between vertical and horizontal MTF50 values amounted to just 2.7%.
