Wide-Open/Custom Function Button (Focus Hold)
Assignable Custom Function Button
On A7 series, A6300, A6500 and A9, the button on the adapter serves as the assignable "Focus hold" button found on Sony G series lenses. You may for example assign "Aperture Preview" or "Eye-AF" to the the "Focus Hold" button on an A7 series camera, A6300, A6500 or A9 and get the same DOF preview function as on a Canon DSLR. This assignable button function is available only on A7 series, A6300, A6500 and A9. Consult your camera's owner's manual.
- Press MENU button of the camera.
- Navigate to the 'Gear' tab.
- Go to page 7 on A7R Mark II, or some other page depending on camera.
- Find 'Custom Key Settings'.
- Go to page 2.
- Set the desired function under 'Focus Hold Button'.
On A5000, NEX series and VG series cameras, when the adapter is in Advanced mode, or the camera body is in Movie mode, the lens' aperture is set to wide open for ease of focusing while the Wide-Open (WO) button of the Metabones Speed Booster / Smart Adapter is depressed. Release the button and the lens will return to the aperture set on the camera.
This wide-open function is automatically shut off when you actually take a picture and during movie capture.
On A5000 and NEX series camera bodies, this wide-open function is unavailable when the Metabones Smart Adapter is in Green Mode.