Tamron SP 150-600 mm f/5-6.3 Di VC USD review - Coma, astigmatism and bokeh

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Tamron SP 150-600 mm f/5-6.3 Di VC USD

16 May 2014

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The Tamron 150–600 mm should be praised for its coma correction. No matter what focal length you use, it is very difficult to find any deformations of the circular shape of the diode, even if you look at the corner of full frame.

Tamron SP 150-600 mm f/5-6.3 Di VC USD - Coma, astigmatism and bokeh

The lens doesn’t have any astigmatism-related problems either. That aberration’s level is very low in the range from 150 to 450 mm, as the average difference between horizontal and vertical MTF function values amounts to just 2.8%. Only at 600 mm focal length the astigmatism increases to a noticeable but still moderate level of 7%.

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The defocused images provided by the tested Tamron look good and seem to be beyond reproach. Purists might claim they see some concentric stripes in them ( the so-called onion ring bokeh) but such an effect is not especially intensive.