You can adjust how the focus shifts when operating the Focus Ring manually.
Click [Focus Ring Function Setting] at the top-left of the home screen.
* Download the TAMRON Lens Utility >>
On the Focus Ring Function Setting screen, click [Select] under [MF Method].
MF Method screen is displayed. Select [Non-Linear] or [Linear], and then click [Save] to complete the setting process.
The amount of focal point movement changes based on how fast you rotate the Focus Ring. By adjusting the rotational speed, you can adjust focus intuitively.
The focal point moves based on how much you rotate the Focus Ring. With this setting the Focus Ring operates similar to the focusing ring of a manual lens. When shooting video, focus control can be performed easily by operating the ring. * The rotational angle (i.e., the length of the arc through which the ring rotates) can be set for some models.