Never really been into serious macro photography. So, I don't know a darn thing about extension tubes. Educate me guys, what size does what? In other words lets say I have a lens that gives me .25x at min focusing distance of 4' what size tube would I use to get close enough to get one to one, one to two ect.... I know a lens specifically for macro photography is best but I don't do enough macro work and don't want another lens lying around.