The TCL-X100 II is a dedicated tele-conversion lens for narrowing the field of view by multiplying the fixed focal length by approx. 1.4x, converting it to 50mm (35mm format equivalent). The new conversion lenses deliver premium picture quality without having to change the F stop value. The X100F automatically recognizes it when a conversion lens is mounted, and displays a guide frame indicating the shooting area when in the OVF mode.