Canon EF 100-400 mm f/4.5-5.6L IS II USM
7. Coma, astigmatism and bokeh
| Center, 100 mm, f/4.5 | Corner APS-C, 100 mm, f/4.5 | Corner FF, 100 mm, f/4.5 |
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| Center, 200 mm, f/5.0 | Corner APS-C, 200 mm, f/5.0 | Corner FF, 200 mm, f/5.0 |
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| Center, 300 mm, f/5.0 | Corner APS-C, 300 mm, f/5.0 | Corner FF, 300 mm, f/5.0 |
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| Center, 400 mm, f/5.6 | Corner APS-C, 400 mm, f/5.6 | Corner FF, 400 mm, f/5.6 |
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When it comes to the astigmatism its correction is a bit worse than that of coma. The average difference between horizontal and vertical MTF50 function values amounted to 6.6% but it is not a result you should worry about. Still it must be mentioned that the 200 mm focal length contributed the most to that value as it was the worst– in its case the astigmatism reached 11.2%. The shortest focal length had a truly sensational result of just 1.8% for a change.
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For a zoom lens the defocused circles of light look very well. The light spread is very even; the one thing you can have reservations about is a light rim which intensity increases with the stopping down.
| Center, 300 mm, f/5.0 | Corner APS-C, 300 mm, f/5.0 | Corner FF, 300 mm, f/5.0 |
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| Center, 300 mm, f/7.1 | Corner APS-C, 300 mm, f/7.1 | Corner FF, 300 mm, f/7.1 |
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Center, 300 mm, f/10.0 | Corner APS-C, 300 mm, f/10.0 | Corner FF, 300 mm, f/10.0 |
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