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Canon EF-S 17-85mm resolution, with Canon EOS 350D / XT
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To measure resolving power we photographed
the standard ISO 12233 test chart with each lens at f8 using a Canon EOS-350D
/ Rebel XT in Aperture Priority mode. The crops are taken from the originals
and presented here at 100%. Each number represents 100 lines per picture
height (lpph), so a figure of 18 means a resolution of 1800 lpph.
The image left was taken with the Canon EOS-350D using the 17-85mm EF-S
at 35mm f8; the original JPEG measured 2.50MB. With 1800 lpph of horizontal
and vertical resolution, the 17-85mm EF-S slightly out-performs the 18-55mm
EF-S, although the 17-40 EF L squeezes a fraction more from the 350D / Rebel
XT sensor. |
UPDATE: we have now tested the Canon EF-S 17-55mm f/2.8 IS USM lens and compared it against the three lenses here using our latest charts. Visit our Canon EF-S 17-55mm review for the latest results. To see how these lenses also compare on an EOS 400D / XTi, see our latest Canon lens group test.
Canon EF-S 17-85mm f4~5.6 IS USM
Using Canon EOS-350D / Digital Rebel XT |
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Canon EF-S 18-55mm f3.5~5.6
Using Canon EOS-350D / Digital Rebel XT |
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1800 lpph, 17-85mm EF-S at 35mm, f8, 1/40, 100 ISO |
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1750 lpph, 18-55mm EF-S at 35mm, f8, 1/60, 100 ISO |
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Canon EF 17-40mm f4.0L USM
Using Canon EOS-350D / Digital Rebel XT |
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1850 lpph, 17-40mm EF L at 35mm, f8, 1/50, 100 ISO |
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Canon EF-S 17-85mm f4~5.6 IS USM
Using Canon EOS-350D / Digital Rebel XT |
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Canon EF-S 18-55mm f3.5~5.6
Using Canon EOS-350D / Digital Rebel XT |
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1800 lpph, 17-85mm EF-S at 35mm, f8, 1/40, 100 ISO |
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1750 lpph, 18-55mm EF-S at 35mm, f8, 1/60, 100 ISO |
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Canon EF 17-40mm f4.0L USM
Using Canon EOS-350D / Digital Rebel XT |
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1800 lpph, 17-40mm EF L at 35mm, f8, 1/50, 100 ISO |
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