The focus plane tilting adapter is particularly recommended for sun photography in the h-alpha range, when disturbing wavy lines appear in the image (this is more or less a natural interference phenomenon). The adapter can be used to tilt the camera sensor slightly in relation to the optical axis, thus eliminating interference waves.
For deep-sky photography, the device serves the opposite purpose: if for some reason the camera sensor is not perpendicular to the optical axis, this adapter can be used to correct it.
The 6 adjustment screws on the adapter allow you to adjust the focal plane in any direction. There are T2 threads on each side for attaching different devices.