Canon EF 17-40mm f/4L USM lens, (tested with cropped-frame APS-C body)

Canon EF 17-40mm f/4L USM corner sharpness using Canon EOS 400D / XTi


Canon 17-40mm results continued…

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

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To measure and compare the corner sharpness of each lens using the Canon EOS 400D, we photographed the Enhanced Digital Camera Resolution Chart with each lens at its shortest and longest focal lengths using various aperture settings. The 400D was set to Large Fine JPEG mode and its Standard Picture Style. All four lenses were tested within moments of each other under identical lighting conditions.

The crops are taken from the lower left corner of the chart and presented here at 100%. The wide angle crops show a slightly larger area of the chart because the minimum focusing distances forced us to shoot from a little further away. No crops have been resized.

Zoomed-out to wide angle, the EF 17-40mm performs well in the corners, although it should do being corrected for a much larger full-frame body; that said, it’s far from perfect on a cropped body and here exhibits a little coloured fringing and a drop in contrast at smaller apertures.

Zoomed-into its longest focal length and with the aperture wide open, the EF 17-40mm is actually quite soft in the corners – this is a bit of a disappointment considering again it should be corrected for a much larger full-frame body. That said we found this lens performs much better when zoomed-out than it does zoomed-in, and as the results below show, the corner sharpness can be greatly improved by closing the aperture a little.

Canon EF 17-40mm f/4.0L USM
Canon EF-S 17-85mm f/4-5.6 IS USM
Canon EF-S 18-55mm f/3.5-5.6
Canon EF-S 17-55mm f/2.8 IS USM
Canon 17-40mm EF L - f2.8 not available
Canon 17-85mm EF-S - f2.8 not available
Canon 18-55mm EF-S - f2.8 not available
Canon 17-55mm EF-S at 17mm f2.8
f2.8 not available
f2.8 not available
f2.8 not available
17-55mm EF-S at 17mm f2.8
Canon 17-40mm EF L at 17mm f4
Canon 17-85mm EF-S at 17mm f4
Canon 18-55mm EF-S at 18mm f3.5
Canon 17-55mm EF-S at 17mm f4
17-40mm EF L at 17mm f4
17-85mm EF-S at 17mm f4
18-55mm EF-S at 18mm f3.5
17-55mm EF-S at 17mm f4
Canon 17-40mm EF L at 17mm f8
Canon 17-85mm EF-S at 17mm f8
Canon 18-55mm EF-S at 18mm f8
Canon 17-55mm EF-S at 17mm f8
17-40mm EF L at 17mm f8
17-85mm EF-S at 17mm f8
18-55mm EF-S at 18mm f8
17-55mm EF-S at 17mm f8
Canon 17-40mm EF L at 17mm f16
Canon 17-85mm EF-S at 17mm f16
Canon 18-55mm EF-S at 18mm f16
Canon 17-55mm EF-S at 17mm f16
17-40mm EF L at 17mm f16
17-85mm EF-S at 17mm f16
18-55mm EF-S at 18mm at f16
17-55mm EF-S at 17mm f16
             
Canon EF 17-40mm f/4.0L USM
Canon EF-S 17-85mm f/4-5.6 IS USM
Canon EF-S 18-55mm f/3.5-5.6
Canon EF-S 17-55mm f/2.8 IS USM
Canon 17-40mm EF L - f2.8 not available
Canon 17-85mm EF-S - f2.8 not available
Canon 18-55mm EF-S - f2.8 not available
Canon 17-55mm EF-S at 55mm f2.8
f2.8 not available
f2.8 not available
f2.8 not available
17-55mm EF-S at 55mm f2.8
Canon 17-40mm EF L at 40mm f4
Canon 17-85mm EF-S at 85mm f5.6
Canon 18-55mm EF-S at 55mm f5.6
Canon 17-55mm EF-S at 55mm f5.6
17-40mm EF L at 40mm f4
17-85mm EF-S at 85mm f5.6
18-55mm EF-S at 55mm f5-6
17-55mm EF-S at 55mm f5.6
Canon 17-40mm EF L at 40mm f8
Canon 17-85mm EF-S at 85mm f8
Canon 18-55mm EF-S at 55mm f8
Canon 17-55mm EF-S at 55mm f8
17-40mm EF L at 40mm f8
17-85mm EF-S at 85mm f8
18-55mm EF-S at 55mm f8
17-55mm EF-S at 55mm f8
Canon 17-40mm EF L at 40mm f16
Canon 17-85mm EF-S at 85mm f16
Canon 18-55mm EF-S at 55mm f16
Canon 17-55mm EF-S at 55mm f16
17-40mm EF L at 40mm f16
17-85mm EF-S at 85mm f16
18-55mm EF-S at 55mm f16
17-55mm EF-S at 55mm f16

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