Meike 85 mm f/1.4 FF STM review

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Meike 85 mm f/1.4 FF STM

5 December 2024

Maciej Latałło

7. Coma, astigmatism and bokeh

The Meike 85 mm f/1.4 FF STM doesn't show any significant problems with coma. This aberration is imperceptible in the APS-C/DX sensor corners; in the corner of full frame you can notice it only at the maximum relative aperture but even there it oscillates around low and medium level. It's worth adding that this performance is a bit weaker than the respective performance of the rival Sony model.

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

In order to present the full performance in this category we also decided to show crops taken from photos of a starry sky, taken from the upper left-hand corner of full frame. This time we use images registered by f/1.4, f/2.0, and f/2.8. In this case coma is a bit more conspicuous but you have to remember you deal here with an image of a very bright and strongly overexposed star – that's wy so much light went to the 'wings' created by off-axis aberration of higher degrees.

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Corner FF, f/1.4	Corner FF, f/2.0	Corner FF, f/2.8

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to just 9.1%. It's a level on a borderline of low and medium values even though we still count it as low. The respective result of the expensive Sony FE 85 mm f/1.4 GM II was practically identical.

The appearance of out-of-focus images is very nice. The circles feature a very even and smooth light spread. A brighter rim that appears on more distinct stopping down of the aperture is not especially intensive. Circles we got in the frame centre still feature a nice, circular shape even on stopping down to f/2.8, an excellent example of the effect you can achieve by employing as many as 12 aperture blades. Mechanical vignetting is a bit more of a problem – it remains bothersome even on stopping down the aperture by 2 EV.

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

Center, f/2.8	Corner APS-C, f/2.8	Corner FF, f/2.8