Tamron SP AF 90 mm f/2.8 Di Macro
8. Vignetting
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Tamron 2.8/90 is marked with the Di symbol (not Di II) what indicates that it was designed especially to be used with a dSLR, even with the matrices of photographic film frame size. That is why, we did not expect big problems with vignetting. Nevertheless, the level of this fault nicely surprised us. We can try to find out vignetting on a APS-C matrix only at the maximum aperture. In this instance light falloff in the corners reaches 16% (-0.5 value of the stop), which is a totally acceptable value. The change of the stop to f/4.0 results in the disappearance of the problem. Then the light falloff measured in the corners of the frame reached only 3%. It appears that vignetting in Tamron, even in the full frame will be visible only for the f/2.8 and efficiently eliminated for the stops starting from f/4.0 upwards.
