Tamron SP 90 mm f/2.8 Di MACRO 1:1 VC USD
5. Chromatic and spherical aberration
Chromatic aberration
Longitudinal chromatic aberration doesn’t create any problems for the tested lens. Images in front of and behind the focus don’t have any noticeable hue which might be seen in photos below.
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Also the lateral chromatic aberration is negligible. The results on a level of 0.04% mean it can’t be noticed in real life photos. Here the Tamron fares a bit better than the Canon, which had the aberration on a level of 0.06-0.08%, and better than the Nikkor, where these values hovered near 0.05-0.07%. The best result in this category had the Sigma 2.8/105 OS in which case the aberration didn’t exceed 0.03%.
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Spherical aberration
The spherical aberration is corrected very well. We didn’t notice any traces of ‘focus shift’ and the light spread in defocused circles in front of and behind the focus is even and almost the same. It is interesting that on the one side of the focus the optical system still ‘see’ the aperture, even if it’s wide open.
