Meike 85 mm f/1.4 FF STM
5. Chromatic and spherical aberration
Chromatic aberration
The Meike 85 mm f/1.4 FF STM has been virtually packed with special elements so we didn't expect any problems with longitudinal chromatic aberration. Photos below are the proof that indeed, there are no problems whatsoever in this area. |
Now let's check the correction of lateral chromatic aberration – its performance depending on the detector and aperture values shows a graph below.
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The performance is excellent on the edge of full frame. Aberration practically doesn't depend on aperture values and it keeps a negligible level below 0.02%. In case of the edge of the APS-C/DX sensor you can notice an upward trend and the highest value are noted at apertures the most closed down. Still, you remain near 0.04% all the time dealing with values on a borderline between very low and low level. In this category the Meike doesn't provide you any reasons to complain.
| A7R IIIa, RAW, f/1.4 | A7R IIIa, RAW, f/11.0 |
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Sperical aberration
In first photos of this chapter you are able to notice the focus shift effect. What's interesting, it's very slight while passing from f/1.4 to f/2.0 and it becomes a bit more pronounced on further stopping down to f/2.8.Problems with spherical aberration are also visible when it comes to the appearance of out-of-focus circles of light produced before and behind the focus. The first of the circles has a brighter rim and the second one – soft edges. Both these features are a classic example of not perfectly corrected spherical aberration.
| A7R IIIa, f/1.4, before | A7R IIIa, f/1.4, after |
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On the one hand it might be strange that a lens not able to correct spherical aberration properly well shows so good results in the frame centre. On the other hand it's worth to remember that by f/1.4 you get a result of almost 70 lpmm and the best lenses with a similar aperture fastness show results of 76 lpmm. These several lpmm of difference might stem from the presence of not perfectly corrected spherical aberration.
