There are quite a number of different focusing screens available from DHW-fototechnik. These screens will universally fit all the medium format models from TLR to Hy6 though some are better suited for single purposes. The gridded screen helps with framing for architecture for example and the ground glass screen can be excellent for macro work. The split prism and micro prism work as focus aids to help indicated the area of focus, but some prefer to have a clear screen for ease of composition.
Note: I no longer sell Maxwell screens.