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Lens review

Tamron SP 90 mm f/2.8 Di MACRO 1:1 VC USD

11 January 2013
Arkadiusz Olech

7. Coma, astigmatism and bokeh

The Tamron SP 90 mm f/2.8 Di MACRO 1:1 VC USD doesn’t have any problems with coma correction. The image of a diode is by and large the same, no matter whether you put it in the frame centre, in the corner of the APS-C sensor or in the corner of full frame. The image doesn’t change with the value of the aperture either. It is another chapter in which the tested lens can be decidedly praised but it should be mentioned that its main rivals fared as well in this category.

Tamron SP 90 mm f/2.8 Di MACRO 1:1 VC USD - 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.

Tamron SP 90 mm f/2.8 Di MACRO 1:1 VC USD - Coma, astigmatism and bokeh