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Canon EF-S 17-55mm f/2.8 IS USM wide-angle uniformity comparison
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17-55mm EF-S at 17mm f2.8
Mean corner fall-off: 46.8% |
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To measure and compare the Canon 17-55mm's vignetting and light fall-off we photographed a white target with a
highly diffused custom filter using it and a number of rival lenses.
The lenses were tested at their
widest focal lengths with the aperture wide open in
Aperture Priority mode.
The images were analysed with Imatest and the full
areas presented here at a reduced resolution. Bigger percentages are better. |
| The image above was taken with the Canon EF-S 17-55mm lens at 17mm f2.8.
Here the light falls off in the corners to an average of 46.8% of the center
measurement, which while worse than the other three lenses on test, is not unexpected for a lens with a much brighter focal ratio. Note the EF 17-40mm lens performs best here, but it is an f4 L model, and crucially, is designed for use with a full frame sensor. |
Canon EF-S 17-85mm f/4-5.6 IS USM |
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Canon EF-S 18-55mm f/3.5-5.6 |
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Canon EF 17-40mm f/4.0L USM |
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17-85mm EF-S at 17mm f4
Mean corner fall-off: 57.8% |
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18-55mm EF-S at 18mm f3.5
Mean corner fall-off: 68.8% |
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17-40mm EF L at 17mm f4
Mean corner fall-off: 79.4% |
Canon EF-S 17-55mm f/2.8 IS USM telephoto uniformity comparison
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17-55mm EF-S at 55mm f2.8
Mean corner fall-off: 60.8% |
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To measure and compare the Canon 17-55mm's vignetting and light fall-off we photographed a white target with a
highly diffused custom filter using it and a number of rival lenses.
The lenses were tested at their
longest focal lengths with the aperture wide open in
Aperture Priority mode.
The images were analysed with Imatest and the full
areas presented here at a reduced resolution. Bigger percentages are better. |
The image above was taken with the Canon EF-S 17-55mm lens at 55mm f2.8.
Here the light falls off in the corners to an average of 60.8% of the center
measurement, which again is noticeably worse than the other three lenses on test. As explained above though, this is not unexpected for a lens with a much brighter focal ratio. |
Canon EF-S 17-85mm f/4-5.6 IS USM |
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Canon EF-S 18-55mm f/3.5-5.6 |
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Canon EF 17-40mm f/4.0L USM |
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17-85mm EF-S at 85mm f5.6
Mean corner fall-off: 77.5% |
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18-55mm EF-S at 55mm f5.6
Mean corner fall-off: 83.8% |
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17-40mm EF L at 40mm f4
Mean corner fall-off: 82.2% |
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