Don't forget that these things are not made to sell it to the world. They are made because we are being asked to do this, despite the many existing lenses out there, including the ZMs etc. This is niche-niche. And the people who want would a conversion want the end result to be top notch. Otherwise what's the point of pursuing 'superior' lenses when you cannot have the confidence that it works 100% right in the end?