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Canon EF 24-105mm f/4L IS USM Gordon Laing, June 2006 / updated August 2007

Canon 24-105mm results : Outdoor / Resolution / Corner sharpness / Fringe and macro / Geometry / Vignetting

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Click here for the Canon EF 24-105mm lens
Canon EF 24-105mm uniformity, wide angle, tested with EOS 5D

To measure lens vignetting and light fall-off we photographed a white target with a highly diffused custom filter. The lenses were tested at their widest focal lengths with the aperture wide open using a Canon EOS-5D in Aperture Priority mode. The images were analysed with Imatest and the full areas presented here at a reduced resolution. Bigger percentages are better.

All three lenses performed similarly here, with light falling off by almost two thirds by the time it reached the corners. Light fall-off is always a problem with wide-angle lenses, but particularly so for those which have to perform for a full-frame sensor or 35mm film. It's revealing to compare these results with lenses designed for cropped sensors, such as Canon's EF-S 17-85mm. While this may not boast a wide angle equivalent of 24mm, it still only falls off to 57.8% of the maximum by the corners. See our test results of the EF-S 17-85mm.

Canon EF 24-105mm f/4L IS USM
Canon EF 24-70mm f/2.8L USM
Canon EF 17-40mm f/4.0L USM
24-105mm at 24mm f4
Mean corner fall-off: 33.3%
  24-70mm at 24mm f2.8
Mean corner fall-off: 34.1%
  17-40mm at 17mm f4
Mean corner fall-off: 34.3%


Canon EF 24-105mm uniformity, telephoto, tested with EOS 5D

To measure lens vignetting and light fall-off we photographed a white target with a highly diffused custom filter. The lenses were tested at their longest focal lengths with the aperture wide open using a Canon EOS-5D in Aperture Priority mode. The images were analysed with Imatest and the full areas presented here at a reduced resolution. Bigger percentages are better.

Once again, the full-frame coverage presents a challenge to any lens, with all three scoring lower than many equivalent focal length lenses would on cropped bodies. That said, the EF 24-105mm manages to score roughly the same as the EF 24-70mm professional benchmark.

Canon EF 24-105mm f/4L IS USM
Canon EF 24-70mm f/2.8L USM
Canon EF 17-40mm f/4.0L USM
24-105mm at 105mm f4
Mean corner fall-off: 54.5%
  24-70mm at 70mm f2.8
Mean corner fall-off: 52%
  17-40mm at 40mm f4
Mean corner fall-off: 63.1%

Canon 24-105mm results

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