Originally Posted by Musoman
Yes i've seen those Jules, and used them on previous scopes for extension, but they're the threaded type. I know Paul used to use them and maybe still does, but i much prefer the bayonet mount extension tubes
Managed to get a set of 3 nice bayonet ones for my Nikon. I have a set of the threaded ones too but you never know if you will get a tight fitting with that sort, they can tend to have a bit of play in them. I also use an empty Vivitar macro focusing TC that I removed the TC from. That gives me a nice helical focuser with around 30mm of travel.