[Stonius (Markus)]

Originally Posted by AndyG

Hi Markus,


Perhaps these will help:
https://arxiv.org/pdf/1407.0591.pdf

https://jwst.nasa.gov/mirrors.html#1c

Party on

Ah yes - there you go;

Re; the James Webb Scope

"Once in space, getting these mirrors to focus correctly on faraway galaxies is another challenge. Actuators, or tiny mechanical motors, provide the answer to achieving a single perfect focus. The primary mirror segments and secondary mirror are moved by six actuators that are attached to the back of each mirror piece. The primary mirror segments also have an additional actuator at its center that adjusts its curvature. The telescope's tertiary mirror remains stationary."