LensTip.com

Lens review

Tamron 70-210 mm f/4 Di VC USD

7 June 2018
Arkadiusz Olech

7. Coma, astigmatism and bokeh

As long as you stick to the area covering the APS-C/DX sensor coma won’t be bothersome at all. In corners of full frame you see a pronounced connection between that aberration and the focal length. At 70 mm coma is easily visible even though it would be hard to call its level high. At 135 mm it decreases but remains noticeable and at 210 mm it stops being bothersome practically completely.

Here the Tamron lags behind its rivals. The Tokina didn’t have any traces of coma at all and the Nikkor had just slight problems at the shortest focal length, definitely less noticeable than those of the Tamron.

Center, 70 mm, f/4.0 Corner APS-C, 70 mm, f/4.0 Corner FF, 70 mm, f/4.0
Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh
Center, 135 mm, f/4.0 Corner APS-C, 135 mm, f/4.0 Corner FF, 135 mm, f/4.0
Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh
Center, 210 mm, f4.0 Corner APS-C, 210 mm, f/4.0 Corner FF, 210 mm, f/4.0
Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh


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Tamron’s 70–210 mm VC astigmatism, understood as an average difference between horizontal and vertical MTF50 values, amounted to 6.9%. It is a quite sensible result. It’s worth adding that the biggest influence on its value has the 70 mm focal length as its astigmatism level is the highest, amounting to 8.0%.

In this category the Tamron performed better than the Tokina, tied with the Canon within margin of error but was noticeably weaker than the Nikkor.

When it comes to blurry, out-of-focus area we don’t have any reservations. Circles of light look nice, without any local extremes. Even the rim on the edge is not especially accented.

Center, 135 mm, f/4.0 Corner APS-C, 135 mm, f/4.0 Corner FF, 135 mm, f/4.0
Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh
Center, 135 mm, f/5.6 Corner APS-C, 135 mm, f/5.6 Corner FF, 135 mm, f/5.6
Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh
Center, 135 mm, f/8.0 Corner APS-C, 135 mm, f/8.0 Corner FF, 135 mm, f/8.0
Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh Tamron 70-210 mm f/4 Di VC USD - Coma, astigmatism and bokeh