Samyang XP 85 mm f/1.2
7. Coma, astigmatism and bokeh
| Center, f/1.2 | Corner APS-C, f/1.2 | Corner FF, f/1.2 |
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| Center, f/1.8 | Corner APS-C, f/1.8 | Corner FF, f/1.8 |
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The astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to just 4.7%. It is a low level, influenced basically by the performance near f/1.2. After stopping down the aperture to f/1.8-2.0 it disappears practically completely.
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When it comes to the appearance of out-of-focus areas we have no serious reservations. The light spread in the circles is very even, without any distinct rims or local extreme points. Looking closely you are able to notice some traces of onion rings bokeh; it is most likely caused by the aspherical element inside the construction.
Still the significant truncation of circles in the frame corners makes us worry a bit. It is a symptom of distinct mechanical vignetting and it seem the great fastness of the lens is a huge challenge.
| Center, f/1.2 | Corner APS-C, f/1.2 | Corner FF, f/1.2 |
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| Center, f/1.8 | Corner APS-C, f/1.8 | Corner FF, f/1.8 |
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Center, f/2.5 | Corner APS-C, f/2.5 | Corner FF, f/2.5 |
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