Tamron 70-180 mm f/2.8 Di III VC VXD G2
7. Coma, astigmatism and bokeh
| Center, 70 mm, f/2.8 | Corner APS-C, 70 mm, f/2.8 | Corner FF, 70 mm, f/2.8 |
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| Center, 125 mm, f/2.8 | Corner APS-C, 125 mm, f/2.8 | Corner FF, 125 mm, f/2.8 |
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| Center, 180 mm, f/2.8 | Corner APS-C, 180 mm, f/2.8 | Corner FF, 180 mm, f/2.8 |
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Astigmatism,understood as an average difference between vertical and horizontal MTF50 function values, amounted to 4.2%. It is a value on the borderline between very low and low level and we didn't notice any significant differences between particular focal lengths.
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The appearance of defocused circles of light is not abysmal but, unfortunately, you can find some reasons to complain. First of all, aspherical elements inside the lens mean visible onion ring bokeh. Additionally, the lens shows distinct problems with mechanical vignetting because the circle in the corners of full frame is significantly truncated even after stopping down the lens by 2 EV.
| Center, 180 mm, f/2.8 | Corner APS-C, 180 mm, f/2.8 | Corner FF, 180 mm, f/2.8 |
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| Center, 180 mm, f/4.0 | Corner APS-C, 180 mm, f/4.0 | Corner FF, 180 mm, f/4.0 |
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Center, 180 mm, f/5.6 | Corner APS-C, 180 mm, f/5.6 | Corner FF, 180 mm, f/5.6 |
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