EDSDK.EdsSendCommand(_cam, EDSDK.CameraCommand_DriveLensEvf, (int) EDSDK.EvfDriveLens_Near1);
// Near1: Focuses a small step closer
// Near2: Focuses a medium step closer
// Near3: Focuses a large step closer

// Far1: Focuses a small step further
// Far2: Focuses a medium step further
// Far3: Focuses a large step further