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Canon EF 17-40mm f/4L USM corner sharpness using Canon EOS 5D
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To measure corner sharpness we photographed
the Enhanced Digital Camera Resolution Chart with each lens using a Canon
EOS-5D in Aperture Priority mode. The 5D was set to Large Fine JPEG mode
and the Standard Picture Style.
Each lens was tested at its widest and longest focal lengths and with various
apertures using Aperture Priority mode. The crops are taken from the lower
left corner of the chart and presented here at 100%. The wide angle crops
show a larger area of the chart because the minimum focusing distances forced
us to shoot from further away. No crops have been resized. |
Zoomed-out to its widest angle and focused at close range, the 17-40mm is quite soft in its extreme corners, although you only have to move inwards slightly to see a much improved result. It's also revealing to compare corner sharpness when focused at infinity in our Gallery, where at 17mm, the lens is a good performer.
Zoomed-into 40mm and focused at close range, the 17-40mm delivers very good
corner sharpness, compared to the other lenses here, but as seen on our Outdoor results page, the lens becomes quite soft at the extremes when zoomed-in and focused to infinity. It's clearly important to consider all of our results pages to build a complete evaluation of the lens under different conditions. |
Canon EF 17-40mm f/4.0L USM |
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Canon EF 24-105mm f/4L IS USM |
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Canon EF 24-70mm f/2.8L USM |
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f2.8 not available |
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f2.8 not available |
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24-70mm at 24mm f2.8 |
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17-40mm at 17mm f4 |
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24-105mm at 24mm f4 |
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24-70mm at 24mm f4 |
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17-40mm at 17mm f5.6 |
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24-105mm at 24mm f5.6 |
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24-70mm at 24mm f5.6 |
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17-40mm at 17mm f8 |
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24-105mm at 24mm f8 |
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24-70mm at 24mm f8 |
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Canon EF 17-40mm f/4.0L USM |
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Canon EF 24-105mm f/4L IS USM |
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Canon EF 24-70mm f/2.8L USM |
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f2.8 not available |
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f2.8 not available |
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24-70mm at 70mm f2.8 |
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17-40mm at 40mm f4 |
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24-105mm at 105mm f4 |
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24-70mm at 70mm f4 |
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17-40mm at 40mm f5.6 |
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24-105mm at 105mm f5.6 |
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24-70mm at 70mm f5.6 |
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17-40mm at 40mm f8 |
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24-105mm at 105mm f8 |
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24-70mm at 70mm f8 |
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