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I am an owner of the 12" LX90 and i can hear some strange sounds from the declination drives too (when i remember correct, this was the same in my lx200(non gps classic) 8" scope sold ten years ago, but only in azimutal mode), but they are not periodic, but random, they come only in certain declination angles ( not recognized yet ) but the motion of the OTA can only be very, very small, because the motion of the objects ( at power of 120 )
is hardly visible ( < 5" i presume ).
do i have luck. is the error in all these scopes, but below a certain threshold for the most?
Luck? I'd say not. If you're getting declination vibration on the order of 5-arc seconds, high power planetary work will be impossible. I'm afraid it sounds like you have the same problem being experienced by the other (new) LX90 owners.
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Re: New LX90(s) - declination vibration