Tamron 16-300 mm f/3.5-6.3 Di II VC PZD MACRO
7. Coma, astigmatism and bokeh
The astigmatism, understood as an average difference between horizontal and vertical MTF50 function values amounted to 12% so it can be bothersome, especially near the maximum relative aperture. It is also an important factor contributing to the worsening of the image quality; still its level can hardly be called high.
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The appearance of defocused light points is not perfect – you can notice a lot of concentric rings and the intensity of the outer rim increases on stopping down. In the middle of the focal range the situation seems to be more stabilized - the appearance of circles you get in the frame corners doesn’t differ much from their appearance in the centre.
