Steelsring released firmware 1.03 for the STEELSRING NK-F to GFX Auto Focus Adapter. You can get the new firmware for Windows Here and for Mac Here.
2020/02/24
1) Bug fixes, improve Tamron and Sigma F-mount lens compatiability
2) Improve AF lock accuracyFor Mac OS 10.7.5+ users only:
You have to disable Gatekeepr before start firmware updater, and remeber to enable it again when it’s done.
To disable it: sudo spctl –master-disable
To enable it: sudo spctl –master-enable
Please refer to http://osxdaily.com/2015/05/04/disable-gatekeeper-command-line-mac-osx/ for more details
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