It is a focus movement method of interchangeable lenses for mirrorless cameras (DN lens) in relation to the rotational angle of the focus ring during manual focusing.
With “non-linear focus,” the amount of focal point movement varies depending on the focus ring rotational speed.
With linear focus, if the focus ring rotational angle is the same, the amount of focal point movement remains the same regardless of the focus ring rotational speed.
By changing the turning speed, it is possible to achieve both large focus movement and fine focus adjustment, but since the amount of movement of the focus position changes depending on both the turning angle and speed, it can be difficult to predict how much the focus moves when operating the focus ring.
For compatible lenses, please check the correspondence table.
Compatibility of Linear focus