Im 99% sure that is the only difference. I mean theres not much you can do to change a little piece of glass in flexible tube.
I know, but they sure command a lot for the "innovation". I've heard from a photog friend of mine (who has met the guy) that the Lens Baby "inventor" is one cocky fellow...he apparently thought he was "too good" to speak at a function he attended. That kinda sucks...

