Tamron 16-300 mm f/3.5-6.3 Di II VC PZD MACRO review - Coma, astigmatism and bokeh

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Tamron 16-300 mm f/3.5-6.3 Di II VC PZD MACRO

4 June 2014

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The coma makes itself felt the most at 16 mm where it deforms quite significantly the point-like image of a diode. At longer focal lengths its level is far lower, appearing as just a delicate magnification of the image of a diode compared to the image you observe in the centre.

Tamron 16-300 mm f/3.5-6.3 Di II VC PZD MACRO - 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.