The Yongnuo YN 50mm f/1.8 S DA DSM has finally become avalible from most US retailors and just released their fourth firmware updte for the Yongnuo YN 50mm f/1.8 S DA DSM, which you can download here and the manual is available here.
V04 2020/4/30
1.Optimize the small aperture focusing performance of individual fuselage.
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Yongnuo YN 50mm f/1.8 S DA DSM: B&H Photo / Amazon / Adorama