Telescope alignment above instrument fields of view. Right after fine phasing, the telescope will be well aligned at a person position inside the NIRCam field of perspective. Now the alignment need to be prolonged to the remainder of the devices. Changes in the segments then bring about 18 nicely-corrected "telescopes". https://jameswebbertelescope72603.worldblogged.com/16951008/indicators-on-james-webb-telescope-you-should-know