2 ms·
They're spaced out over miles, so presumably they'd take a wide shot of a bunch of them and check that the focus on one side of the frame to the other would be
by astrodust 10y ago
They're spaced out over miles, so presumably they'd take a wide shot of a bunch of them and check that the focus on one side of the frame to the other would be consistent.
Think of it as an eye chart for satellites.