Mitakon Speedmaster 85 mm f/1.2 review - Coma, astigmatism and bokeh

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Mitakon Speedmaster 85 mm f/1.2

10 July 2015

Arkadiusz Olech

7. Coma, astigmatism and bokeh

At the maximum relative aperture the coma is visible even in the corner of the APS-C/DX sensor. In the full frame corner it is already distinct but still its level cannot be called very high. What’s interesting, the Canon 1.2/85 II didn’t fare much better in this category and even the slower and noticeably more expensive Otus didn’t manage to avoid coma in corners of full frame.

Center, f/1.2	Corner APS-C, f/1.2	Corner FF, f/1.2

Center, f/1.8	Corner APS-C, f/1.8	Corner FF, f/1.8

We have no reservations concerning the astigmatism correction. An average difference between horizontal and vertical MTF50 function values amounted to 9.5% which is perhaps not a very low result but doesn’t make us worry. Still the rivals fared a tad better here (e.g. the Canon – 3.6%, the Otus – 5%).

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The appearance of blurry areas can be described only in superlatives for a change. Defocused circles have a very even light spread; they look even better than those of the Otus which still had some traces of ‘onion ring’ bokeh. However once again the size of the mount becomes a problem because the rings we got in the frame corners are not only shaped like teardrops but also their bottoms are truncated.

Center, f/1.2	Corner APS-C, f/1.2	Corner FF, f/1.2

Center, f/1.4	Corner APS-C, f/1.4	Corner FF, f/1.4

Center, f/2.0	Corner APS-C, f/2.0	Corner FF, f/2.0