Canon EF 24-105 mm f/4L IS II USM
7. Coma, astigmatism and bokeh
The performance is very similar to that of the Sigma 24-105 mm OS and the cheaper Canon 24-105 mm STM. The new lens seems to be a bit better than its predecessor which showed traces of coma already in the APS-C corners.
| Center, 24 mm, f/4.0 | Corner APS-C, 24 mm, f/4.0 | Corner FF, 24 mm, f/4.0 |
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| Center, 40 mm, f/4.0 | Corner APS-C, 40 mm, f/4.0 | Corner FF, 40 mm, f/4.0 |
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| Center, 70 mm, f/4.0 | Corner APS-C, 70 mm, f/4.0 | Corner FF, 70 mm, f/4.0 |
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| Center, 105 mm, f/4.0 | Corner APS-C, 105 mm, f/4.0 | Corner FF, 105 mm, f/4.0 |
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When it comes to astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, it amounted to 10.5% which means its level is on a borderline between low and medium values. In fact, during the test we noticed huge difference between the shorter focal lengths, where that aberration was low, and the longer end of the focal lengths spectrum where, at 70 mm, it reached 14.2% and at 105 mm it went as high as 15.7% so could be placed on a borderline high and medium level.
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The blur areas don’t look that bad for a zoom lens. The circles aren’t especially truncated by vignetting and the light spread in them seems to be more or less even. You can find some local extreme points inside but they aren’t especially distinct. The rim becomes more and more intensive when you stop the lens down.
| Center, 105 mm, f/4.0 | Corner APS-C, 105 mm, f/4.0 | Corner FF, 105 mm, f/4.0 |
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| Center, 105 mm, f/5.6 | Corner APS-C, 105 mm, f/5.6 | Corner FF, 105 mm, f/5.6 |
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Center, 105 mm, f/8.0 | Corner APS-C, 105 mm, f/8.0 | Corner FF, 105 mm, f/8.0 |
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