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

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

Canon EOS 350D with 17-85mm vs Canon EOS 5D with 24-105mm corner sharpness

To compare the corner sharpness of the Canon 350D / XT with the EF-S 17-85mm against the Canon 5D with the EF 24-105mm, we photographed the Enhanced Digital Camera Resolution Chart with each lens at their widest and longest focal lengths and various apertures in Aperture Priority mode.

The EOS 350D / XT and EOS 5D were set to their best quality JPEG and default image tone and sharpening settings. The crops are taken from the extreme lower left corner of the chart and presented here at 100%.

The Canon EF-S 17-85mm clearly exhibits greater geometric distortion and coloured fringing than the EF 24-105mm when both lenses are zoomed-out to their widest positions. Stopping down the former improves the sharpness slightly, but the colour remains.

Zoom both lenses into telephoto though and the story changes. Here the EF-S 17-85mm delivers much sharper results in the far corners than the EF 24-105mm; indeed the latter is quite soft in the corners even at f8.

Note: crop details taken from the same chart which appear smaller here are due to them being captured with lower resolution cameras and / or a lens which couldn't focus as close to the chart. In each case though, the crop still represents the extreme left corner of each camera's frame.

Corner sharpness, wide angle

Canon EF-S 17-85mm f/4-5.6 IS USM with EOS 350D / Rebel XT
Canon 17-85mm at 17mm f4
Canon 17-85mm at 17mm f5.6
Canon 17-85mm at 17mm f8
Canon 17-85mm at 17mm f16
17-85mm EF-S at 17mm f4
17-85mm EF-S at 17mm f5.6
17-85mm EF-S at 17mm f8
17-85mm EF-S at 17mm f16

Canon EF 24-105mm f/4L IS USM with EOS 5D
Canon 24-105mm at 24mm f4
Canon 24-105mm at 24mm f5.6
Canon 24-105mm at 24mm f8
Canon 24-105mm at 24mm f16
24-105mm at 24mm f4
24-105mm at 24mm f5.6
24-105mm at 24mm f8
24-105mm at 24mm f16

Corner sharpness, telephoto

Canon EF-S 17-85mm f/4-5.6 IS USM with EOS 350D / Rebel XT
Canon 17-85mm at 85mm - f4 not available
Canon 17-85mm at 85mm f5.6
Canon 17-85mm at 85mm f8
Canon 17-85mm at 85mm f16
f4 not available
17-85mm EF-S at 85mm f5.6
17-85mm EF-S at 85mm f8
17-85mm EF-S at 85mm f16

Canon EF 24-105mm f/4L IS USM with EOS 5D
Canon 24-105mm at 105mm f4
Canon 24-105mm at 105mm f5.6
Canon 24-105mm at 105mm f8
Canon 24-105mm at 105mm f16
24-105mm at 105mm f4
24-105mm at 105mm f5.6
24-105mm at 105mm f8
24-105mm at 105mm f16

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

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

All words, images, videos and layout, copyright 2005-2017 Gordon Laing. May not be used without permission.

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