I know that a 2x Teleconverter will make a 400mm lense effectivly a 800mm lense. I know that Macro Extension tubes will increase the magnification of your macro lense. Does the extension tube make (for example) a 60mm macro lense a say 100mm (depending on the size of the extension tube) or does it work that way? Can you use extension tubes on a standard lense to make it a macro? Can you use a teleconverter on a marco lense?