Tamron SP 90 mm f/2.8 Di MACRO 1:1 VC USD
7. Coma, astigmatism and bokeh
The astigmatism, understood as an average difference between horizontal and vertical MTF50 function values is slight. The result of 4.2%, reached by us, can be considered as situated on the borderline between very good and good level. Still you should keep in mind the fact that we state here an average value for three biggest relative apertures. In the case of the Tamron you can notice it only at the maximum relative aperture where it is medium – in fact it is one of the main optical aberrations which influence the image quality there. On slight stopping down, however, that aberration becomes practically zero.
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The appearance of off-focus images also should be praised. The circles feature even light spread; a slightly lighter rim on the very edge is noticeable only after more significant stopping down.
