Question about Bushnell NorthStar 78-8846 (675 x 114mm) Telescope
My north star goto scope is ok but the main problem with it is as follows: when i focus on lets say the moon with no help with the finder scope(red-dot) it came with. the scope ALWAYS moves up ward by it's self. the motor is off and when the power is on it does the same. i was told to get a counter weight for it because the mirror (it's at the bottem of the tube) weights so much and tends to make it move upwards. is thier a way to tighten any screws or bolts to stop this problem. p.s the finder scope is not usful at all.
Posted by BILLY ROMAN on
Hi.I have the same problem.I bought a few 1oz magnets and place them
under the tube at the bottom by the mirror. They counter ballance the
real eyepieces. Depending what I put in the focuser tube determines how
many magnets. Better yet,dump that junk if you can.I hope to.
Posted on Feb 10, 2008
Sorry i couldn't answer you on the live chat. here is the link for the user manual for your scope if you need it; http://www.bushnell.com/customer_service/manuals/telescopes/78-8890_Northstar.pdf Page 5 has a fairly detailed photo of how the hinge assembly should look. The counterweight should help - any tightening up you do other than the hand adjustable items has the potential to damage the scope, the motor or the tripod, but make sure that at the hinge at the top of the tripod there is not a damaged or missing washer/spacer and ensure no lubricants have got in contact with it. If you want to make up a counterweight of your own just to see if it solves the problem, then i would suggest getting a small bag with a cloth tape type strap and hang it just in front of the finder scope - fill it with clean dry sand until it weighs about a quarter of the weight of the telescope - half maximum, but start small and see how much you need - don't overload it as there is a possibility of making the scope/tripod unstable or overloading the motor. I would recommend contacting Bushnell for advice especially if you still have a warranty - they apparently give good customer service, and , there may possibly be a fault in your particular batch of tripods that they can solve for you; http://www.bushnell.com/customer_service/contact.cfm?section=General%20Use The finder scope is more for calibrating/aligning the scope before using the motorized feature, so is not designed to be ideal for general "finding", but in some conditions they have their uses - remember that having a really good finder scope could potentially nearly double the price of the unit. These are pretty good scopes in general, even without the automated features. Good luck, I hope this helps, please ask again if you need more :)
Posted on Apr 22, 2007
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The tripod is very sensitive to the touch. After positioning subject in telescope with small lens, then replace it with a heavier lens, the telescope won't hold that position. Is there an adjustment that can solve this problem?