Tamron SP 70-200 mm f/2.8 Di VC USD
7. Coma, astigmatism and bokeh
When it comes to the astigmatism the average difference between horizontal and vertical MTF50 function values amounted to 6.4%. It is not such a splendid result as in the case of the coma but still you can consider it good; it’s obvious the lens deals with the astigmatism pretty well.
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The bokeh the tested lens creates also deserves to be praised. Both the sample shots and the appearance of defocused light circles prove it. The light spread is very even, without any local extremes. What’s more, already by f/4.0 and in the corner of the APS-C/DX sensor the circle doesn’t differ much from that in the centre. To get a similar result in the corner of full frame you have to close the lens down to f/5.6.
