3 ms·
It would be good to know what off-axis or on-axis means in the context of telescope mirrors.
by dnate 9y ago
It would be good to know what off-axis or on-axis means in the context of telescope mirrors.
- eesmith 9y agohttps://en.wikipedia.org/wiki/Reflecting_telescope#Off-axis_designs https://en.wikipedia.org/wiki/Reflecting_telescope#Off-axis_...