Canon EF 50 mm f/1.8 II
7. Coma, astigmatism and bokeh
| Center, f/1.8 | APS-C corner, f/1.8 | FF corner, f/1.8 |
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| Center, f/2.5 | APS-C corner, f/2.5 | FF corner, f/2.5 |
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The situation with the astigmatism correction is much nicer. The average difference between horizontal and vertical MTF50 function values amounted to 6.2% which is a good result, in fact quite close to very good. It’s also worth adding that the astigmatism is noticeable only by f/1.8 and f/2.0 ; from f/2.8 upwards it becomes negligible.
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When it comes to the appearance of defocused images our impressions are divided. We like very even light spread, visible in the circles, without any borders, concentric rims or brightness decrease on the edges. Unfortunately that positive image is spoiled by the aperture with only five diaphragm blades and very high vignetting which makes the circles truncated in the frame corners.
| Center, f/1.8 | APS-C corner, f/1.8 | FF corner, f/1.8 |
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| Center, f/2.5 | APS-C corner, f/2.5 | FF corner, f/2.5 |
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Center, f/3.5 | APS-C corner, f/3.5 | FF corner, f/3.5 |
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