In this flash mode, when you enter the shooting distance value, the Speedlight automatically controls the light output according to the aperture set. You can take pictures that have the same exposure even when shooting at different apertures. Flash output level is automatically compensated by changing the flash output.

This is not a new functionality name for T042. This existing flash mode has been called "distance-priority manual flash mode" in Speedlight manuals and "range-priority manual flash mode" in camera manuals. From T042, "distance-priority manual flash mode" is going to be used for both Speedlight manuals and camera manuals.