Tamron SP 150-600 mm f/5-6.3 Di VC USD
5. Chromatic and spherical aberration
The crops below show very clearly that the tested lens experience no serious problems with the longitudinal chromatic aberration. Even at the maximum relative aperture you must look very closely to notice that images behind the focus come with a delicate yellowish cast and those in front of the focus seem to be slightly bluish. Three low dispersion elements work as they were supposed to do.
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The lateral chromatic aberration correction also deserves to be praised. At shorter focal lengths it is practically imperceptible, oscillating near 0.04% no matter on what detector. The worst situation can be observed at the maximum focal length where that aberration level reaches near 0.07-0.09%. Still it can hardly be called a problem – those values we consider the borderline between low and medium levels.
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The graphs, shown below, present the values of the lateral chromatic aberration you get respectively on the APS-C/DX and on full frame.
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Spherical aberration
At no focal length the lens shows any „focus shift” effect. If you look at defocused light points we got in front of and behind the focus you can notice some differences, though. I mean here mainly the lack of light rim in the image in front of the focus and a distinct rim you see in the image behind the focus. Still those differences are not pronounced enough to asses the spherical aberration correction in a negative way.
