Canon EOS 350D with 17-85mm vs EOS 5D with 24-105mm wide-angle uniformity
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To compare the wide angle lens vignetting and light fall-off of the Canon 350D / XT with the EF-S 17-85mm against the Canon 5D with the EF 24-105mm, we photographed a white target with a
highly diffused filter; each lens was focused to infinity with its aperture wide open. The images were then analysed with Imatest and the full areas presented here
at a reduced resolution. Bigger percentages are better.
The EF-S 17-85mm is well-known for its noticeable light fall-off when zoomed-out to wide angle, but the EF 24-105mm on a full-frame body like the 5D is almost twice as bad. This unfortunately is the big disadvantage of using a body with a full-frame sensor, as it's forced to use the extreme outer areas of lenses. Towards the corners of the frame, the light rays are also striking the sensor's micro-lenses at a shallower angle, which further accentuates the problem. |
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Canon EOS-350D / Digital Rebel XT
Using Canon
EF-S 17-85mm f/4-5.6 IS USM |
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Canon EOS-5D
Using
Canon EF 24-105mm f/4L IS USM |
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17-85mm EF-S at 17mm f4
Mean corner fall-off: 57.8% |
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24-105mm EF at 24mm f4
Mean corner fall-off: 33.3% |
Canon EOS 350D with 17-85mm vs EOS 5D with 24-105mm telephoto uniformity
To compare the telephoto lens vignetting and light fall-off of the Canon 350D / XT with the EF-S 17-85mm against the Canon 5D with the EF 24-105mm, we photographed a white target with a
highly diffused filter; each lens was focused to infinity with its aperture wide open. The images were then analysed with Imatest and the full areas presented here
at a reduced resolution. Bigger percentages are better.
With each lens zoomed-in, the difference is closer, but the EF-S 17-85mm still remains noticeably superior in terms of vignetting than the EF 24-105mm on a full-frame body. Light fall-off is one of the biggest problems with a full-frame body, and its effect with the EF 24-105mm at both wide angle and telephoto are clearly illustrated in our Gallery. |
Canon EOS-350D / Digital Rebel XT
Using Canon
EF-S 17-85mm f/4-5.6 IS USM |
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Canon EOS-5D
Using
Canon EF 24-105mm f/4L IS USM |
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17-85mm EF-S at 85mm f5.6
Mean corner fall-off: 77.5% |
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24-105mm EF at 105mm f4
Mean corner fall-off: 54.5% |
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