Steelsring release a firmware update for their GFX AF adapter, which you can download for Windows Here and Mac Here. 2020/06/07 1) Bug fixes 2) Improve support for Sigam Lenses (50 ART) For 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: … Continue reading STEELSRING NK-F to GFX Auto Focus Adapter Firmware 1.04