Quote Originally Posted by StoneNYC View Post
Gotcha, okay that makes sense, but at least the ruler idea make sense still, however my question now is how the heck do I know what I have on my lenses that I own now, is there a marking point that I'm supposed to look for, I don't remember seeing any of those zeros with lines through them...
If your lenses are either telephotos or retro-focus designs, the "marking point" would be outside the body of the lens.

You need to use the other tools available for this purpose unless and until you determine where the nodal point is.