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Lens review

Samyang XP 85 mm f/1.2

11 April 2017
Maciej Latałło

7. Coma, astigmatism and bokeh

When it comes to coma correction the Canon 1.2/85 fared weakly. The Mitakon was a bit better but still that aberration was distinct in the corner of full frame and by f/1.2. Compared to those the Samyang 1.2/85 is actually the best. Deformations of diode images are slight and they allow us to state that the coma is corrected properly by the tested lens.

Center, f/1.2 Corner APS-C, f/1.2 Corner FF, f/1.2
Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh
Center, f/1.8 Corner APS-C, f/1.8 Corner FF, f/1.8
Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh

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
Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh
Center, f/1.8 Corner APS-C, f/1.8 Corner FF, f/1.8
Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh
Center, f/2.5 Corner APS-C, f/2.5 Corner FF, f/2.5
Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh Samyang XP 85 mm f/1.2 - Coma, astigmatism and bokeh