Canon EF-S 17-55mm f/2.8 IS USM - Canon EF-S 17-55mm f/2.8 IS USM wide-angle uniformity comparison

Canon EF-S 17-55mm f/2.8 IS USM wide-angle uniformity comparison

Canon EF-S 17-85mm f/4-5.6 IS USM
Canon EF-S 18-55mm f/3.5-5.6
Canon EF 17-40mm f/4.0L USM
Canon 17-85mm telephoto geometry test
Canon 18-55mm telephoto geometry test
Canon 17-40mm telephoto geometry test
17-85mm EF-S at 85mm f8
Distortion: 0.967% pincushion
18-55mm EF-S at 55mm f8
Distortion: 0.389% pincushion
17-40mm EF L at 40mm f8
Distortion: 0.187% pincushion
Canon 17-55mm wide angle uniformity test
17-55mm EF-S at 17mm f2.8
Mean corner fall-off: 46.8%

The lenses were tested at their widest focal lengths with the aperture wide open in Aperture Priority mode.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 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
Canon EF-S 18-55mm f/3.5-5.6
Canon EF 17-40mm f/4.0L USM
Canon 17-85mm wide angle uniformity test
Canon 18-55mm wide angle uniformity test
Canon 17-40mm wide angle uniformity test
17-85mm EF-S at 17mm f4
Mean corner fall-off: 57.8%
18-55mm EF-S at 18mm f3.5
Mean corner fall-off: 68.8%
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

Canon 17-55mm telephoto uniformity test
17-55mm EF-S at 55mm f2.8
Mean corner fall-off: 60.8%

The lenses were tested at their longest focal lengths with the aperture wide open in Aperture Priority mode.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 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.

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