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Dear authors,

Sorry, but this article does not answer the most exciting question, namely: how do the actuators know in which direction to turn the mirrors? It would be great if this info could be added. — Preceding unsigned comment added by 92.74.118.83 ( talk) 08:20, 15 October 2020 (UTC) reply

Can we confirm JWST uses active optics ? It has 7 actuators on each of 18 primary mirror segments, and some actuators on secondary and tertiary mirrors. - Rod57 ( talk) 12:08, 21 February 2022 (UTC) reply