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Canon digital SLR upgrade - EOS 350D / XT versus EOS 5D Gordon Laing, November 2006

Outdoor
/ Resolution / Noise / Noise 2 / Corner sharpness / Fringe & macro / Geometry / Vignetting

Canon EOS 350D with 17-85mm vs EOS 5D with 24-105mm wide-angle uniformity

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
Canon EOS-5D
Using Canon EF 24-105mm f/4L IS USM
Canon EOS 350D with 17-85mm EF-S lens at 17mm f4
Canon EOS 5D with 24-105mm EF lens at 24mm f4
17-85mm EF-S at 17mm f4
Mean corner fall-off: 57.8%
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
Canon EOS-5D
Using Canon EF 24-105mm f/4L IS USM
Canon EOS 350D with 17-85mm EF-S lens at 85mm f5.6
Canon EOS 5D with 24-105mm EF lens at 105mm f4
17-85mm EF-S at 85mm f5.6
Mean corner fall-off: 77.5%
24-105mm EF at 105mm f4
Mean corner fall-off: 54.5%


Canon EOS 350D / Rebel XT versus EOS 5D results

Outdoor / Resolution / Noise / Noise 2 / Corner sharpness / Fringe & macro / Geometry / Vignetting
All words, images, videos and layout, copyright 2005-2014 Gordon Laing. May not be used without permission.

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