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by exDM69
3734 days ago
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> This is still the case for the Alt-Az telescopes. For stability, telescopes are built on a foundation that ... Yeah, most certainly. But you can build much bigger telescopes with Alt-Az mounting, right? I have a hard time imagining a 10 or 30 meter telescope on an Eq mounting. > Actually, there's usually a third rotation axis often added to instruments (or their mount points) for Alt-Az telescopes, called a field rotator. Thanks for this snippet of information, I had not heard about a third axis. Is the third axis on the instrument only? Ie. the optics are on Alt-Az mount with two axes and the CCD is mounted on a third? |
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