Is There an Error in the Hubble Lens?

It takes like 12 weeks just to cast the basic shape. This thing is spinning the whole time. Then they very gradually cool it for six more months. And then they have years of polishing ahead of them, because they need to get this thing down to incredibly smooth. They want the deviations from their desired shape to be than the wave length of the light that they are looking at. And so they've been working on this since two thousand and five, when they finished the first mirror.