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Canon EF 17-40mm f/4L USM lens (full-frame tests) Gordon Laing, December 2006 / updated July 2007

More Results : Outdoor / Resolution / Corner sharpness / Fringe and macro / Geometry / Vignetting

 
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Canon EF 17-40mm f/4L USM corner sharpness using Canon EOS 5D

  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
Canon EF 24-105mm f/4L IS USM
Canon EF 24-70mm f/2.8L USM
Canon EF 17-40mm - f2.8 not available   Canon EF 24-105mm - f2.8 not available   Canon EF 24-70mm at 24mm f2.8
f2.8 not available
f2.8 not available
24-70mm at 24mm f2.8
         
Canon EF 17-40mm at 17mm f4
Canon EF 24-105mm at 24mm f4
Canon EF 24-70mm at 24mm f4
17-40mm at 17mm f4
24-105mm at 24mm f4
24-70mm at 24mm f4
Canon EF 17-40mm at 17mm f5.6
Canon EF 24-105mm at 24mm f5.6
Canon EF 24-70mm at 24mm f5.6
17-40mm at 17mm f5.6
24-105mm at 24mm f5.6
24-70mm at 24mm f5.6
Canon EF 17-40mm at 17mm f8
Canon EF 24-105mm at 24mm f8
Canon EF 24-70mm at 24mm f8
17-40mm at 17mm f8
24-105mm at 24mm f8
24-70mm at 24mm f8
         
Canon EF 17-40mm f/4.0L USM
Canon EF 24-105mm f/4L IS USM
Canon EF 24-70mm f/2.8L USM
Canon 17-40mm EF L - f2.8 not available   Canon 24-105mm EF - f2.8 not available   Canon EF 24-70mm at 70mm f2.8
f2.8 not available
f2.8 not available
24-70mm at 70mm f2.8
         
Canon EF 17-40mm at 40mm f4
Canon EF 24-105mm at 105mm f4
Canon EF 24-70mm at 70mm f4
17-40mm at 40mm f4
24-105mm at 105mm f4
24-70mm at 70mm f4
Canon EF 17-40mm at 40mm f5.6
Canon EF 24-105mm at 105mm f5.6
Canon EF 24-70mm at 70mm f5.6
17-40mm at 40mm f5.6
24-105mm at 105mm f5.6
24-70mm at 70mm f5.6
Canon EF 17-40mm at 40mm f8
Canon EF 24-105mm at 105mm f8
Canon EF 24-70mm at 70mm f8
17-40mm at 40mm f8
24-105mm at 105mm f8
24-70mm at 70mm f8

Canon 17-40mm results continued...

Outdoor / Resolution / Corner sharpness / Fringe and macro / Geometry / Vignetting
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