Tamron 17-35 mm f/2.8-4 Di OSD
8. Vignetting
| Canon 50D, 17 mm, f/2.8 | Canon 50D, 17 mm, f/4.0 |
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| Canon 50D, 26 mm, f/3.5 | Canon 50D, 26 mm, f/5.6 |
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| Canon 50D, 35 mm, f/4.0 | Canon 50D, 35 mm, f/5.6 |
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In the case of the 17 mm focal length and the maximum relative aperture the loss of light in the frame corners gets to 28% (−0.94 EV) and then decreases to 12% (−0.36 EV) on stopping down the aperture to f/4.0. By f/5.6 the vignetting decreases a bit more to a value of 11% (−0.34 EV).
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The situation is a bit better in the middle of the focal range. At the maximum relative aperture vignetting amounts to 22% (−0.73 EV) and by f/4.0 it decreases to 17% (−0.54 EV). When you pass to the f/5.6 aperture the tested aberration drops some more, to a value of 13% (−0.40 EV) to be more precise.
The best situation can be observed at the maximum relative aperture: by f/4.0 the vignetting is 18% (−0.57 EV) and it decreases to 11% (−0.35 EV) on stopping down the aperture to f/5.6.
Now let’s check how the Tamron 17-35 mm fares in this category on the full frame detector of the Canon 5D Mark III.
| Canon 5D III, 17 mm, f/2.8 | Canon 5D III, 17 mm, f/4.0 |
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| Canon 5D III, 26 mm, f/3.5 | Canon 5D III, 26 mm, f/5.6 |
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| Canon 5D III, 35 mm, f/4.0 | Canon 5D III, 35 mm, f/5.6 |
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A difficult combination of sensibly small physical dimensions, an ultra-wide angle of view and a fast f/2.8 aperture makes itself felt here. In the frame corners you lose as much as 64% of light (−2.95 EV). By f/4.0 and f/5.6 apertures that loss is diminished to, respectively, 45% (−1.72 EV) and 33% (−1.17 EV). Even by f/8.0 and f/11.0 the vignetting still remains noticeable as it amounts to 27% (−0.93 EV).
At the 26 mm focal length there is a strong improvement. At the maximum relative aperture the aberration, described here, gets to 43% (−1.60 EV). By f/4.0 it decreases to 34% (−1.20 EV), and by f/5.6 it drops to 22% (−0.73 EV). Further stopping down doesn’t influence vignetting in any measureable way.
Like in the case of the EOS 50D the best result you can observe at 35 mm. By f/4.0 the vignetting reaches 31% (−1.08 EV), and then drops to 21% (−0.67 EV), on stopping down the aperture to f/5.6. By f/8.0 the vignetting decreases even more, amounting to 18% (−0.59 EV).
| Canon 5D Mk III, 17 mm, f/2.8 |
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| Canon 5D Mk III, 26 mm, f/3.5 |
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| Canon 5D Mk III, 35 mm, f/4.0 |
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