These aren't your standard bifocals.
The telescopes consist of 24 concentric shaped-conic sections. The x-rays come in at very small angles and are reflected onto the detector plates. They get around 300x300 pixels after several thousand seconds of exposure.
There are three parallel telescopes -- the "lenses" are a few meters away from the detectors so they have to be mounted on an extension bellows.
It's all very cool. The images will be amazing.