Tamron 16-300 mm f/3.5-6.3 Di II VC PZD MACRO
8. Vignetting
At the shortest focal length and the maximum relative aperture the vignetting is 35% (-1.26 EV). It is a distinct level but still nothing tragic. On slight stopping down to f/4.0 you see this aberration reduced to 30% (−1.03 EV); by f/5.6 it reaches 21% (-0.70 EV) and by f/8.0 it is about 20% (−0.68 EV). Then it stops reacting to stopping down at all.
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At 50 mm focal length you get a local vignetting minimum as that aberration would be difficult to spot there, even with the lens wide open, and small wonder – it reaches just 12% (-0.37 EV) and, on stopping down to f/5.6, it disappears practically completely, amounting to just 9% (-0.28 EV).
The 100 mm focal length is not much worse. By f/5.6 the brightness loss in the corners amounts to a slight level of 18% (-0.58 EV). The problem disappears almost completely already by f/8.0, where its value we determined as 8% (-0.25 EV).
A bit more problems you see at longer focal lengths but still you can call their vignetting level moderate. At 200 mm and by f/6.3 it amounts to 27% (-0.93 EV) and it decreases to 16% (-051 EV) by f/8.0. By f/11 that aberration stops being noticeable as it is just 9% (−0.27 EV). At the maximum focal length the values we got were not much higher. By f/6.3 the vignetting was 30% (−1.03 EV), and by f/8.0 it reached 18% (-0.57 EV). The problem stopped being bothersome by f/11 and f/16 where the vignetting level was respectively 10% (−0.30 EV) and 6% (−0.18 EV).
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