Tamron SP 150-600 mm f/5-6.3 Di VC USD
8. Vignetting
At the maximum relative aperture and at the shortest focal length the vignetting is just 16% (-0.49 EV) and it decreases to an imperceptible level of 8% (-0.23 EV) right after you stop down the aperture to f/5.6 so just by 1/3 EV.
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At 300 mm focal length there are even less problems – at the maximum relative aperture the vignetting amounts to just 12 % (-0.37 EV) and it decreases to 6% (-0.18 EV) by f/8.0. A similar situation can be observed at 450 mm. By f/6.3 the vignetting is 15% (-0.46 EV) and it decreases to 7% (-0.21 EV) by f/8.0.
The biggest chance to notice any vignetting you get at the maximum focal length where, by f/6.3, it reaches 19% (-0.61 EV). Fortunately already by f/8.0 it becomes practically imperceptible, getting to 9% (-0.29 EV).
For obvious reasons there are more problems with the brightness loss in the frame corners, if you attach the tested lens to a full frame camera. The thumbnails, shown below, let you know what should be expected.
At the shortest focal length and the maximum relative aperture the vignetting reaches a noticeable level of 35% (-1.25 EV). By f/5.6 it decreases to 24% (-0.80 EV) and by f/8.0 it becomes imperceptible (8%).
A bit better situation can be seen at 300 mm focal length. At the maximum relative aperture the light fall-off in the corners gets to 28% (-0.93 EV) and it decreases to 12% (-0.36 EV) by f/8.0. By f/11 the vignetting becomes imperceptible, amounting to just 5% (-0.16 EV).
The aberration, described in this chapter, starts increasing when you pass to the longer end of the focal range. At the combination of 450 mm and f/6.3 the vignetting amounts to 33% (-1.17 EV) and it drops to 20% (-0.63 EV) on employing f/8.0 aperture. By f/11 and f/16 it is respectively 12% (−0.36 EV) and 5% (−0.14 EV).
At 600 mm and with the lens wide open you must take into account the loss of 37% of light (-1.34 EV) in the frame corners. By f/8.0 that aberration is still noticeable (but decreasing to a moderate level) as it reaches 22% (-0.70 EV). The problems disappear only by f/11 and f/16 where the vignetting is respectively 12% (−0.39 EV) and 5% (−0.14 EV).
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