Tamron SP AF 70-200 mm f/2.8 Di LD (IF) MACRO
5. Chromatic aberration
At 200 mm focal length, though, especially when using wide apertures, we will have the aberration above the 0.12% level. The worst situation is when you work with a converter- on significant stopping down the aberration level will be high.
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When you compare this performance with that of the Tamron’s rivals, you see that it was not so bad. Sigma showed similar trends but in its case, the aberration increased quicker on stopping down. Both Canons had some problems when cooperating with a converter but without it they worked a tad better than the Tamron.