At every focal length the problem is similar here. At the maximum relative aperture the vignetting is visible, although not huge, and it disappears almost completely on stopping down by one stop. At 55 mm and by f/4.0 the light fall-off in the frame corners amounts to 21% (0.6 EV), but already by f/5.6 – only to 6%. At 130 mm and by f/4.0 the vignetting is 20% and by f/5.6 it decreases to 8%. The best situation we see at 200 mm where, at the maximum relative aperture, we get the vignetting of 13.5% (0.42 EV) and on stopping down by one stop it decreases to 5.5%.
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