The holder for the Seroco are wood with a glass plate in it. They are old n rickety. Someone told me I'd have to cut sheet film down to fit and make some sort of adapter for it. I'll see if I can get a pic later.
The Maximar is the camera I'd really like to get going because I hear there are roll film backs for em. If anyone has, I'd like to buy one (local US please). I don't like shopping flea-bay, I'd rather one of you guys instead cuz I know it'll be the right one n work properly as well.
What's the native format of your maximar. 6x9 or 9x12? I have a 6x9 maximar, that I use with both single sheet holders and a roll film back with 6x6 and 6x9 inserts. It's a wonderful tool.