hahaha - I shot a 7x17 for years with a wax paper GG
eventually..I graduated to picture frame glass sprayed with 'dulling' spray
Printable View
Maxwell screens are the best but are quite expensive.
You should at least try an excellent conventional ground glass screen first, and if the Canham that was represented is too expensive, try Steve Hopf.
Bosscreens use a wax layer between two sheets of glass, and apparently work pretty well, but do NOT leave them in the trunk of your car in hot weather. They state that it will melt above 55 degrees C. I live where I can't avoid the camera sitting in a hot car on occasion, and thus have not been interested in this technology.
Rick "who eventually spent the money for a Maxwell screen" Denney
I can personally recommend Steve Hopf. He made custom 5x7 focusing screens for me. I am very happy with the results. Just google his name to find his website. His prices are very reasonable.