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Canon EF 24-105mm corner sharpness, tested with 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. |
The EF 24-105mm clearly out-performs the other two lenses on test in
terms of extreme corner sharpness at wide angle. We must point out that
the sharpness of both the EF 24-70mm and EF 17-40mm results improved dramatically
only a short distance in, but at the extreme corners they did appear quite
soft at open apertures. While this is not unusual, it does illustrate how
well-corrected the EF 24-105mm is at wide angle, even when set to an open aperture.
The story however changes once each lens is zoomed-in to its longest focal
length. Here the EF 24-105mm is the softest of the group, while both the EF 24-70mm
and EF 17-40mm deliver good results even with their apertures wide open. The
EF 17-40mm is particularly impressive here, although other results with this lens focused to infinity show soft corners when zoomed-into 40mm - see our Canon EF 17-40mm review. |
Canon EF 24-105mm f/4L IS USM |
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Canon EF 24-70mm f/2.8L USM |
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Canon EF 17-40mm f/4.0L USM |
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f2.8 not available |
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24-70mm at 24mm f2.8 |
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f2.8 not available |
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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 f4 |
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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 f5.6 |
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24-105mm at 24mm f8 |
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24-70mm at 24mm f8 |
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17-40mm at 17mm f8 |
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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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Canon EF 17-40mm f/4.0L USM |
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f2.8 not available |
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24-70mm at 70mm f2.8 |
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f2.8 not available |
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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 f4 |
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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 f5.6 |
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24-105mm at 105mm f8 |
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24-70mm at 70mm f8 |
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17-40mm at 40mm f8 |
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