For maximum sharpness of an image made with a view camera, or any format camera, the lens and film (digital sensor) planes should be exactly parallel to each other; and when photographing flat surfaces (artwork, posters, documents, etc.), lens and film planes must also be perfectly parallel to the copy. All view cameras have mechanical variations in the accuracy of their "zero" centering positions for swing and tilt movements and these tiny variations can cause a noticeable lack of focus precision.
Better Light's extremely high-resolution imaging produces exceptional photographs, but also can be unforgiving... dramatically showing any error in overall focus or corner-to-corner sharpness. Below are several sets of components for checking alignment in varied photographic applications. In each case, a blank lens board for your camera is required to mount the Ring Module.