What mount?
Added info
Rebranded Samyang?
Some Photokina shots by ML
Review
The sharpness figures do not really do justice to the lens. Because the lens to chart distance is so close the best performance is not being found and shots taken of 3D subjects at more normal distances look much sharper than the figures would suggest. Field curvature may well be a factor in this.
https://www.ephotozine.com/article/meike-12mm-f-2-8-lens-review-30051
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