Canon EF 400 mm f/4 DO IS II USM
7. Coma, astigmatism and bokeh
| Center, f/4.0 | Corner APS-C, f/4.0 | Corner FF, f/4.0 |
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| Center, f/5.6 | Corner APS-C, f/5.6 | Corner FF, f/5.6 |
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| Center, f/5.6 | Corner APS-C, f/5.6 | Corner FF, f/5.6 |
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| Center, f/8.0 | Corner APS-C, f/8.0 | Corner FF, f/8.0 |
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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 6.6%, a value we deem to be moderate. What’s interesting, after attaching the teleconverter to the lens it didn’t increase, remaining exactly 6.6%.
Defocused circles of light aren’t perhaps perfect but it’s due to the DO technology which can generate a lighter ‘bullet point’ and circular rings. Also the mechanical vignetting makes itself felt a bit.
| Center, 400 mm, f/4.0 | Corner APS-C, 400 mm, f/4.0 | Corner FF, 400 mm, f/4.0 |
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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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Center, 400 mm, f/8.0 | Corner APS-C, 400 mm, f/8.0 | Corner FF, 400 mm, f/8.0 |
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| Center, 560 mm, f/5.6 | Corner APS-C, 560 mm, f/5.6 | Corner FF, 560 mm, f/5.6 |
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| Center, 560 mm, f/8.0 | Corner APS-C, 560 mm, f/8.0 | Corner FF, 560 mm, f/8.0 |
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Center, 560 mm, f/11.0 | Corner APS-C, 560 mm, f/11.0 | Corner FF, 560 mm, f/11.0 |
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