I wonder why Rod nor Shneider don't offer Macro longer than 150 or so...like a 210 or 240 or 300...?at least oone of them?
I have a 1:3 3:1 macro Sinaron 300mm... but this is a 50 degree LF lens. I have always opted for the longest macro I can get.
I have about 1.5m of Sinar bellows and rail ... the main problem with long macro lenses is the meters of extension you need.