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I had my previous observatory, around 1.85 m the height was determined by allowing the pole finder to work, so it needed to get a fix.
The positives of high walls are, protection from wind, security,
The downsides are obviously no access to lower egions of the sky.... For long focal length work this is not such a problem, but for comets which can be quite low this can be disappointing
My last observatory allows the whole building to roll away, given I went to a refractor, the wind is less of an issue than a large newt.
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