Sigma 100-300 mm f/4 DG EX APO IF HSM
8. Vignetting
The situation at 200 mm is ideal. Even at wide open aperture the vignetting is almost invisible (8%) and at f/5.6 it decreases almost to zero.
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The slight problem, although it is still diminutive, would be at the 300 mm focal length. At f/4.0 the light fall off in the corners of the frame is 15% (-0.46 the value of the diaphragm). When we decrease the diaphragm by one stop the failure almost disappears (5%).
