My preferred super-telephoto lenses are my 5.6/400 T-Noflexar and a Leitz Telyt 6,8/560, both can be attached to a PIGRIFF-C, that is the basic module with two grips from the 1980s. I use it with an EOS 1v.
A few days ago I got an old-style Novoflex equipment at a bargain price. It comes with a 5.6/280 and a 5.6/400 head, a bellows labeled CONTA and a mount labeled KONIBA. All mounts are different from the modern Novoflex mounts I know, everything is a lot smaller and lighter.
Are there any experts for this system around that can tell me what I have here and how I can attach it to a modern camera system like Nikon or EOS?