A little info that might help someone. Wanted a cheap angle finder to fit the prism finder on my Mamiya 645 (I prefer the metered prism over WLF) but wanted a means of getting low level shots occasionally). Bought one of those cheap seagull ones that come with a range of adapters. The adapters are a bit flimsy, but the good news is the seagull finder fits a Mamiya M645 without using an adapter. The seagull finder itself is pretty good. Optically it is more than adequate (not sure I will ever use the x3.3 switch on it). Construction seems pretty good and I am sure is more than adequate for the occasional use I will give it. Just so this info is out there.