3 ms·
This, of course, was not the reason for the eventual problems, but to illustrate that this kind of thing was understood. For some reason I had thought this (gr
by jessaustin 5y ago
This, of course, was not the reason for the eventual problems, but to illustrate that this kind of thing was understood.
For some reason I had thought this (gravity stuff) was the problem. What was the actual problem?
- azernik 5y agoA device for measuring the final grinding had been miscalibrated (by a known, constant amount). The result was a spherical aberration, of a kind that is familiar to a lot of users of cheaper lenses and mirrors but on a much smaller scale.
- krisoft 5y agoExactly as azernik says. If you are interested in a lot more detail this reports spills the tea: https://www.ssl.berkeley.edu/~mlampton/AllenReportHST.pdf https://www.ssl.berkeley.edu/~mlampton/AllenReportHST.pdf