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Whilst I don't think a motorised focuser is essential, I have to say that
fitting an electric drive to my focuser was quite possibly the best $89.50
I have ever spent on astro gear. Just not having to touch the OTA whilst focusing was sheer looksharay, as they used to say in a TV series set in Yorkshire. Of course, the luxury gets less as the mass of the scope rises,
until eventually the scope doesn't shake at all when the focuser is touched.
raymo
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