If you are registered, you get access to the members only section, can participate in the buy & sell second hand forum and last but not least you can reserve your preferred username before someone else takes it.
Yes you can. Before I gave my Bay50 lenses to my son I used a an adapter for 52mm screw in filters. Since it fits the inner bayonet and the shade the outer bayonet there is no problem. It works the same way for Bay60 and 67mm screw in filters with an adapter.