The https://www.antiquecameras.net/softfocuslenses3.html lists 6 different Gundlach Hyperion lens sizes.
The two biggest ones are Nr 5 that can be combined into sizes 14", 20" and 36" and Nr 7 that can be combined into 18", 36" and surprisingly again 36".
Can somebody explain this? Why should somebody want to have Nr 7 instead of Nr 5? What were the advantages?
Bookmarks