Canon EF 24-105mm f/4L IS USM purple fringing using Canon 400D / XTi
To measure and compare the Canon 24-105mm's purple fringing caused by lens chromatic aberrations and sensor
blooming, we photographed a test chart with areas of very high contrast
using it and a number of rival lenses.
We tested each lens at its
widest and longest focal lengths with the aperture wide open.
The crops are taken from the upper left
corner of the chart and presented here at 100%.
Despite being designed for use on a full-frame body, the Canon EF 24-105mm is not free from fringing when mounted on a cropped-frame body. Indeed fringing can be apparent across the range, especially when zoomed-out. That said, the other lenses here aren't free from fringing either.
Canon EF 24-105mm f/4.0L IS USM
Canon EF-S 17-85mm f/4-5.6 IS USM
Canon EF-S 18-55mm f/3.5-5.6
Canon EF 17-40mm f/4.0L USM
24-105mm EF L at 24mm f4
17-85mm EF-S at 17mm f4.0
18-55mm EF-S at 18mm f3.5
17-40mm EF L at 17mm f4
24-105mm EF L at 105mm f4
17-85mm EF-S at 85mm f5.6
18-55mm EF-S at 55mm f5.6
17-40mm EF L at 40mm f4
Canon EF 24-105mm f/4L IS USM macro using Canon 400D / XTi
24-105mm EF L at 105mm f8
Max area of 90x60mm
To measure and compare the Canon 24-105mm's macro performance on a cropped-frame body we photographed
a chart using it and a number of rival lenses at a focal length and distance which
delivered the maximum possible reproduction.
The dark lines are 10mm apart and the result is not cropped. Smaller areas
are preferred in this test.
The image left was taken with the Canon EF 24-105mm mounted on an EOS 400D / XTi body and zoomed-into 105mm f8 where it captured an area measuring 90x60mm. This is roughly the same as the EF 17-40mm and a small improvement over the EF-S 17-85mm, but the EF-S 18-55mm kit lens beats them all here. Now let's look at the geometric distortion for this lens.
Canon EF-S 17-85mm f/4-5.6 IS USM
Canon EF-S 18-55mm f/3.5-5.6
Canon EF 17-40mm f/4.0L USM
17-85mm EF-S at 85mm f8
Max area of 104x70mm
18-55mm EF-S at 55mm f8
Max area of 66x44mm
17-40mm EF L at 40mm f8
Max area of 92x62mm
Canon EF 24-105mm with EOS 400D / XTi results continued...
