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Canon EOS 350D with 17-85mm vs EOS 5D with 24-105mm wide-angle geometry
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To compare the wide angle geometric distortion of the Canon 350D / XT with the EF-S 17-85mm against the Canon 5D with the EF 24-105mm, we photographed a test chart consisting of a grid pattern
at an aperture of f8.
The images were then analysed with Imatest using 5th Order line calculation and
the full areas presented here at a reduced resolution. Smaller percentages are better.
Both lenses exhibit similar degrees of geometric distortion at wide angle, although the EF-S 17-85mm is slightly worse. This distortion can be quite visible on real-life subjects with straight lines placed close to the edges of the frame. Also note some light fall-off is visible in the corners of the EF 24-105mm sample - see the next page for analysis of this. |
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 f8
Distortion: 5.71% barrel |
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24-105mm EF at 24mm f8
Distortion: 5.29% barrel |
Canon EOS 350D with 17-85mm vs EOS 5D with 24-105mm telephoto geometry
To compare the telephoto geometric distortion of the Canon 350D / XT with the EF-S 17-85mm against the Canon 5D with the EF 24-105mm, we photographed a test chart consisting of a grid pattern
at an aperture of f8.
The images were then analysed with Imatest using 5th Order line calculation and
the full areas presented here at a reduced resolution. Smaller percentages are better.
Here both lenses exhibit pincushion distortion, although it's much more pronounced on the EF 24-105mm. Again this would be noticeable on real life subjects with straight lines placed close to the edge of the frame. |
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 f8
Distortion: 0.967% pincushion |
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24-105mm EF at 105mm f8
Distortion: 1.62% pincushion |
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