The Focal script comes with three blur types: radial blur, linear blur, and tilt shift blur. These three options determine the type of gradient ramp created for the camera lens blur to use.
The tilt shift blur option, as you may have guessed, creates a straight band of focus with blur either side, it's essentially a dedicated tool for after effects Tilt Shift effects in moments.
Usually, creating a tilt shift gradient ramp manually requires a fair few steps, and customising where the band of focus is can be particularly tricky, especially when it’s being done without seeing how the blur is being affected.
With Focal, controlling the tilt shift blur is much easier, just set the focus point controller to the area you’d like to be clear, and then drag the blur controller to adjust the tightness of the blur effect and the rotation of the tilt shift blur. The handy on-screen guide layers also highlight the structure of the blur and how the controllers are affecting the blur.