I realize that with anything except the MP-E there are basically three ways to get past 1:1...
1) reverse mounting another lens
2) extension tubes
3) teleconverters(I know quality is compromised, but I already own one so I am curious)
I am not however clear on how exactly each method affects magnification.
I have done a quick search of the forum and google and I found numerous posts where someone said 'I have lens "x" with extension tube "y" and reverse mounted lens "z", what magnification do i have?' The more knowledgeable members of the community are always able to offer an answer. My question is, how do you know? Is there a formula for each method?
Thank you in advance,