Canon EF 24-105 mm f/3.5-5.6 IS STM
7. Coma, astigmatism and bokeh
| Center, 24 mm, f/3.5 | Corner APS-C, 24 mm, f/3.5 | Corner FF, 24 mm, f/3.5 |
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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/5.6 | Corner APS-C, 70 mm, f/5.6 | Corner FF, 70 mm, f/5.6 |
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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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The astigmatism, understood as an average difference between horizontal and vertical MTF50 function values and computed across the whole focal lengths, looks sensible as its value is 6.1%. Still it must be remembered there are places where it can be bothersome. For example at the maximum relative aperture and at 40 mm it is able to reach 16% and at the shortest focal length it gets to 12%.
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The blurred area doesn’t look bad for such a low-budget zoom lens. The circles are not especially truncated by the vignetting and the light spread inside them is more or less even. You can notice some local extremes but, fortunately, they are not very distinct.
| 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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Center, 105 mm, f/11.0 | Corner APS-C, 105 mm, f/11.0 | Corner FF, 105 mm, f/11.0 |
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