Re: attaching other lenses, here's an adapter that permits you use M42 whatever on your Bronica. The only downside is that going to M42 means you're not going to be able to use the full 57mm of the lens mount. But there's a lot you can with an M42 mount...

http://www.ebay.com/itm/Bronica-S2-c...item45f9e14564