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Thanks Chris, guiding corrections (though I have never heard them) is sort of what I thought it sounded like. As if it was constantly correcting for errors it was imagining. The vibration seems stronger when it is just tracking than when it is slewing.
Barry, I have started trying to find the nearest repair station. If you feel it is not backlash then I am running out of ideas. Power supply is 12V 5a.
I am using a 250mm lens with 20sec exposures, I have a wooden EQ platform I made which would take better pictures than the EQ5 at the moment. It seemed to work the first two nights, so I may pull the cover off, I think there is only one, and check the grease hasn't got hard and thrown off after the first two sessions or something. but because it seems to vibrate more in tracking mode than slewing mode I really don't like my chances.
Might find out how to run it from Stellarium and see if the $420 hand controller is stuffed.
Pete
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