Canon EF 200 mm f/2.0L IS USM
8. Vignetting
At the maximum relative aperture the vignetting of the lens is noticeable but it can hardy be called bothersome. The value, measured by us, amounted to 23% (-0.74 EV). On stopping down the aperture to f/2.8 that problem was eliminated completely – the vignetting was reduced to a negligible value of 5% (-0.14 EV).
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Similar results you get after attaching the converter. At the maximum relative aperture the brightness loss in the frame corners gets to 17% (-0.53 EV) and it becomes imperceptible by f/4.0 reaching just 3% (-0.08 EV).
On full frame the vignetting is of course bigger but you can call it bothersome only at the maximum relative aperture, where it increase to 48% (-1.87 EV). This aberration becomes moderate by f/2.8 where it amounts to 20% (-0.66 EV). From f/4.0 the problem disappears completely, being there just 4% (-0.10 EV), nothing more than a symbolic value.
After using the teleconverter the vignetting slightly decreases; however, at the maximum relative aperture, it would be difficult not to notice it as it gets to the value of 38% (-1.38 EV). It becomes slight by f/4.0 where it reaches 13% (-0.41 EV) and it disappears completely by f/5.6, where it is just 3% (-0.08 EV).
It’s worth noticing here that the results of the Canon 2/200 are a bit worse than those of the Nikkor AF-S 200 mm f/2G ED VRII, which, on full frame, had the vignetting amounting to 32%.
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