Metabones released the new firmware update V0.58 for their Metabones Smart Adapter IV and EF-E Speed Booster ULTRA 0.71x.
Benefits and improvements:
o Continuous video AF performance improvement (works in Advanced mode only)
o Addition of a custom function to Metabones App which lets the user to configure video AF speed/smoothness/noise level.
o EXIF improvement Improved operation with Kenko Pro300 1.4x and 2x (blue dot) teleconverters.
o Fixed a rare phenomenon where an old model camera with Mark V, Speed Booster ULTRA II, CINE Smart Adapter or CINE Speed Booster ULTRA with the IBIS switch at the OFF position may leave the LED indicator on in blue.
o In Green mode, you may now attach an EF Extender first and turn on the camera before attaching a compatible EF telephoto lens. In advanced mode, you must not leave the EF Extender without lens while the EF Extender is attached.
o If you have an early production CINE Smart Adapter or CINE Speed Booster, the manual lens EXIF definition custom function (preset using Metabones App) will no longer activate automatically. Press the WO/CF button on the adapter to activate.
Windows: http://www.metabones.com/article/of/EF-E_Firmware_Win
Mac: http://www.metabones.com/article/of/EF-E_Firmware_Mac