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Lewis,
Re balancing...
Yes, "asymmetrical" balancing of the OTA.
Most of the time the amateurs just position the OTA horizontal and check the balance. When the scope is pointing towards the zenith, finders, guiders, cameras, cables, filter wheels etc etc etc can all lead to an out of balance Dec condition. This can show up as OK guiding with lower altitude stars and rubbish guiding with higher altitude stars....
Definately worth checking out.
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