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Canon EF-S 17-85mm f4~5.6 IS USM lens review Gordon Laing, December 2005

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

Canon EF-S 17-85mm resolution, with Canon EOS 350D / XT

  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.

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Canon EF-S 17-85mm f4~5.6 IS USM
Using Canon EOS-350D / Digital Rebel XT
Canon EF-S 18-55mm f3.5~5.6
Using Canon EOS-350D / Digital Rebel XT
Canon 17-85mm lens horizontal resolution
Canon 18-55mm lens horizontal resolution
1800 lpph, 17-85mm EF-S at 35mm, f8, 1/40, 100 ISO
1750 lpph, 18-55mm EF-S at 35mm, f8, 1/60, 100 ISO

Canon EF 17-40mm f4.0L USM
Using Canon EOS-350D / Digital Rebel XT
 
Canon 17-40mm lens horizontal resolution
1850 lpph, 17-40mm EF L at 35mm, f8, 1/50, 100 ISO


Canon EF-S 17-85mm f4~5.6 IS USM
Using Canon EOS-350D / Digital Rebel XT
Canon EF-S 18-55mm f3.5~5.6
Using Canon EOS-350D / Digital Rebel XT
Canon 17-85mm lens vertical resolution
Canon 18-55mm lens vertical resolution
1800 lpph, 17-85mm EF-S at 35mm, f8, 1/40, 100 ISO
1750 lpph, 18-55mm EF-S at 35mm, f8, 1/60, 100 ISO

Canon EF 17-40mm f4.0L USM
Using Canon EOS-350D / Digital Rebel XT
 
Canon 17-40mm lens vertical resolution
1800 lpph, 17-40mm EF L at 35mm, f8, 1/50, 100 ISO

Canon 17-85mm results continued...

Outdoor / Resolution / Corner sharpness / Fringe and macro / Geometry / Vignetting
All words, images, videos and layout, copyright 2005-2014 Gordon Laing. May not be used without permission.

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