for fluid heads with adapter viewfinder extension The Sachtler 3985 Accessory Mount features 1/4"-20, 3/8"-16, and M8 tapped holes for mounting optional accessories such as a monitor to your fluid head. This item requires you to mount an optional adapter viewfinder extension on your fluid head before you can use the accessory mount.

for fluid heads with adapter viewfinder extension The Sachtler 3985 Accessory Mount features 1/4"-20, 3/8"-16, and M8 tapped holes for mounting optional accessories such as a monitor to your fluid head. This item requires you to mount an optional adapter viewfinder extension on your fluid head before you can use the accessory mount.