Re:Two weeks in, the Webb Space Telescope is reshaping astro...
by SiempreViernes on Tuesday July 26, 2022 @01:28PM
(#32241185)
> So both spy satellites and telescopes use mirrors focused to infinity.
That's just not what focal length means in the context of mirrors, the focussing happens by moving the secondary not by re-grinding the entire primary mirror or whatever it is you are imagining.
That's just not what focal length means in the context of mirrors, the focussing happens by moving the secondary not by re-grinding the entire primary mirror or whatever it is you are imagining.