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Canon EF 24-105mm f/4L IS USM wide-angle geometry using Canon 400D / XTi
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24-105mm EF L at 24mm f8
Distortion: 2.65% barrel |
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To measure and compare the Canon 24-105mm's
geometric distortion on a cropped-frame body we photographed a test chart consisting of a grid pattern,
using it and a number of rival lenses.
The lenses were tested at
their widest focal lengths with an aperture of f8 in
Aperture Priority mode.
The images were analysed with Imatest using 5th
Order line calculation and the full areas presented here at a reduced resolution.
| The image above was taken with the Canon EF 24-105mm lens on the Canon EOS 400D / XTi body at 24mm f8. Barrel distortion was measured at 2.65% which is measurably below that of the two EF-S lenses, especially the EF-S 17-85mm which scores quite badly in this respect. Again this is one of the benefits of mounting a full-frame compatible lens on a cropped-frame body, and the other EF lens below also performs well. It's interesting to compare this to the same EF lenses mounted a full frame body on this page. |
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 f8
Distortion: 5.71% barrel |
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18-55mm EF-S at 18mm f8
Distortion: 3.35% barrel |
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17-40mm EF L at 17mm f8
Distortion: 2.9% barrel |
Canon EF 24-105mm f/4L IS USM telephoto geometry using Canon 400D / XTi
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24-105mm EF L at 105mm f8
Distortion: 0.663% pincushion |
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To measure and compare the Canon 24-105mm's
geometric distortion on a cropped-frame body we photographed a test chart consisting of a grid pattern,
using it and a number of rival lenses.
The lenses were tested at
their longest focal lengths with an aperture of f8 in
Aperture Priority mode.
The images were analysed with Imatest using 5th
Order line calculation and the full areas presented here at a reduced resolution. |
| The image above was taken with the Canon EF 24-105mm lens on the Canon EOS 400D / XTi body at 105mm f8. Pincushion distortion was measured at 0.663% which is an improvement over the EF-S 17-85mm, but not as low as the EF-S 18-55mm kit lens or the EF 17-40mm, which is virtually distortion-free here. The pincushion distortion of the EF 24-105mm when zoomed-in becomes even more noticeable on a full-frame body as can be seen on this results page. Now let's see how the lens performs in terms of vignetting. |
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 f8
Distortion: 0.967% pincushion |
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18-55mm EF-S at 55mm f8
Distortion: 0.389% pincushion |
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17-40mm EF L at 40mm f8
Distortion: 0.187% pincushion |
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