Canon EF 90-300 mm f/4.5-5.6 USM
8. Vignetting
At the 90 mm focal length and maximum aperture the light fall off in the corners of the frame is 17% (-0.55 the value of the diaphragm), which is an average result. Fortunately, after stopping down the lens to f/5.6 the vignetting drops down to 8%.
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The situation is similar at the 135 mm focal length. At f/5.0 the vignetting was 14% (-0.43 EV), which dropped to 9% after using the f/5.6 diaphragm. There wasn’t much of a difference at the 200 mm focal length. At f/5.0 the vignetting was 13% (-0.40 EV) and after stopping it down to f/5.6 it dropped to 9%.
We are going to encounter the biggest vignetting problems at the 300 mm focal length. Here, at the maximum aperture, the vignetting reaches 22% (-0.72 the value of the diaphragm), but after using the f/8.0 diaphragm the problem decreases to 6%.
Although the vignetting values didn’t reach high level at any focal lengths, the Canon EF 90-300 mm seems to be weaker than the competitors. The small compact plastic body of the lens is probably to blame. Full frame camera users could come across some problems with vignetting for this lens.
