I have a Yashica D that takes Bay 1 filters. I was told that there are adapters that will convert your Bay 1 to screw mount filters. I have yet to find one in a store though. I'll let you know if I ever find one!
Thanks for the response Brian.I have found out that the bay 1 mount is also called bay 30.The adapter may be hard to find though.This camera was a flea market find many years ago and has turned out to be my favorite.The bay 1 to 49mm adapter is what i'm hoping to locate.