Mitakon Speedmaster 35 mm f/0.95 review - Coma, astigmatism and bokeh

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Mitakon Speedmaster 35 mm f/0.95

1 July 2015

Arkadiusz Olech

7. Coma, astigmatism and bokeh

One glance at thumbnails below and you know that the coma is huge and even stopping down by 1 EV stop doesn’t help here. It is especially painful as the Mitakon was designed to work on the APS-C/DX sensor. On a smaller Micro 4/3 sensor the off-axis aberrations should have been corrected properly but they aren’t – it is another serious slip-up of the tested lens.

E-PL1, 35 mm, f/0.95, center	E-PL1, 35 mm, f/0.95, corner

E-PL1, 35 mm, f/1.4, center	E-PL1, 35 mm, f/1.4, corner

The astigmatism, understood as an average difference between horizontal and vertical MTF50 values, amounted to 10.4%. It is a medium result but it contributes to the worsening of the image quality. It’s worth reminding here that it will be felt the most by f/0.95 and f/1.4 and it will disappear completely from f/2.0 upwards.

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The light spread in defocused circles is quite even but there is another problem. The tested lens shows clearly that the circular shape of the aperture doesn’t depend only on the number of diaphragm blades but mainly on their shape. The producer boasts of using as many as 10 blades but the entrance pupil remains angular anyway…

E-PL1, 35 mm, f/0.95, center	E-PL1, 35 mm, f/0.95, corner

E-PL1, 35 mm, f/1.4, center	E-PL1, 35 mm, f/1.4, corner

E-PL1, 35 mm, f/2.0, center	E-PL1, 35 mm, f/2.0, corner