Guide :Optics : NorthStar 78-8831 (525 x 76mm) Telescope

Bushnell Northstar Have the same problem as posted by another blogger - can see the moon clearly but not any stars. The lens cap is off.

Posted by Peterlay on Feb 13, 2008

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Bushnell Northstar Have the same problem as posted by another blogger - can see the moon clearly but not any stars. The lens cap is off.


I think as with all who buy a scope you expect to see stars like on a xmas card,but that is not how they look,besides the moon is brilliant with a scope,there are some stars that cannot be seen with the naked eye,only time lapse phography will show them.so dont be dissapointed,is not going to get much clearer.why not join an amateur site like sky and scope or another source on the internet...best of luck and good [email protected]
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Aligning NorthStar For The First Time


THIS WEBSITE IS NO HELP AT ALL !!!
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I have a bushnell northstar 78-8831 and need to know how to reset the telescope. when in align earth mode it asks me to align star 2, skipping over star 1.


This scope has many goto issues. For one there is no way to reset the controller or to reload the firmware inside the hand controller. The firmware is probably corrupted.You can contact their repair and support web site here:http://www.opticsplanet.net/bushnell-warranty.html
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Hello, I have Bushnell Northstar 78-8831 telescope which I got from United States (New York) last year. Since the very first day, I am not able to get the option of "Align Start 1" After selecting Align Earth option, it directly goes to "Align start2". As a result, I am not able to align the planetary positions and manually align the telescope everytime. Can you please advise? Regards, Gaurav


This can be caused by many things-- such as dirt or grease on the encoders inside or a slipping clutch. I know you just bought this telescope, but Bushnell is NOT KNOWN for having quality telescopes.To get the goto to work everything must be according to the manual.The tripod needs to be perfectly level-- time, date, and site must be accurate, and the alignment objects must each be centered in the eyepiece. Sounds like you also have electronic issues with the hand controller. Only Bushnell can repair this scope.
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Cannot see anything.


Start by adjusting the focus draw tube all the way in, then back a little bit. In the day time indoors, remove the lens from the draw tube. Look into to the draw tube. You should be able to see your eye centered in the mirror. If you cannot see your eye at all, either the primary is tipped drastically or the secondary mirror is way out of adjustment. In that event I would return this scope to where you got it.
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Cannot see anything.


In addition.... you can download the complete manual immediately here : http://www.astronomics.com/main/documents/bushnell/78-8890_northstar.pdf cheers
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78-8831 Just got a 78-8831 and set it up according to instructions. After inserting lens into eyepiece, I can't see anything at all. Dont worry, I've removed the front cap from the the main telescope. Something leads to believe I'm either missing something real fundamental or my telescope is broken. Please help


There is a mirror that can be moved to use the top or back eyepiece.The lever is at the back on the leftDeon
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Just black Hi I just recently bought a Meade ds-2114ats-tc and I tried to use it last night with the kids, unfortunaltey after we set up the telescope all we could see was black. Yes we did make sure that the lens cap was off and that there was nothing blocking anything, we also tried setting it up in a couple of different spots in the back yard where we were close to a light source and also away from a light source. Basically everything I tried did not work but I am new to this so I could be doing something wrong still. I tried to manually look at the brightest star in the sky and still nothing....just black. Could I be setting this up in an area where there in either not enough light getting in or to much? This is my first time using a telescope so I don't even really know if I should be setting this up in the complete dark area or with a light source around like a backyard light for example. I am extremely confused please help.


I just got one of these today and they are different. My guess is you are having a focusing problem rather than alignment. Assuming of course you are removing the larger dustcap and not just the smaller one ha ha ha. The instructions include how to align but maybe you can use this Mine has two dustcaps, one full size with a smaller one in its center. Had the smaller one been offset it could have been used as an aperture stop to reduce thermal effects on bright objects such as Jupiter and the Moon. Another thing is a built in barlow within the focuser draw tube. This inreases the focal ratio of "f" number and makes align far more trickier than if it had been a straight Newtonian. Set-up the scope under and point at the bright blue sky in the day time. Pull off the small center dust cover and make sure the diagonal holder is centered under the small hole in the larger dust cover. If not that can be accomplished by adjusting the three thumb nuts on the front edge of the tube. Once this is done remove the larger dust cover and peer into the focuser from the side with the eyepiece removed. You should see blue sky and all the components should be centered. One can judge fairly well that their eye is centered but a simple trick is to draw an eyepiece sized circle on a piece of paper and using a pick or pencil, poke a small hole dead center on the circle. Place the circle centered over the draw tube and peer through that. No other tool will improve on the accuracy of this almost free and simple one. Now moving your eye closer to the focuser you should see the reflection of your own eye or in this case the hole in the center of the paper. The paper reflects and transmits enough light that it provides a bright enough targert to canter. Now you must experiment to determine which component is mis-alighned and what adjustment is required to correct. Try flexing each componet before loosening any adjustment screws.This will give you an idea of which component and in which manner it needs to move. Now my guess is, while you have some mis-alignment the almost f:9 focal ratio makes the image extra dark and so contrasty that if you are out of focus all you will see is dark. With your 28mm eyepiece, now point the scope at a daylight scene some distance away and bring the image to a focus. Note hoe far your draw tube is extended so you will be in that neighbohood come night time. I suspect this was your problem more than mis-alignment.
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A lens is missing - Bushnell NorthStar 78-8831 (525 x 76mm) Telescope


This telescope uses 1.25 inch eyepieces. Comes originally with a 20mm and a 4mm (probably cheap modified acromats) The 4mm would exceed the maximum practical magnification. 50x per inch. Many eyepieces available on Ebay and telescope vendors. If the 20mm is missing, buy a 20mm Plossl. I prefer other designs focal lengths under 12.5mm because of the eye relief. Agenaastro makes great, inexpensive ($55). I like the Sterling Plossls from Smartastronomy too Eyepieces for planetary viewing I suggest the 5.2mm for your high power or a TMB planetary (Astronomics has them for $50 Get the 5 or 6mm Clear Skies!
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No instuction manual


I have the instructions and Owner's manual for the NG76AZDCA; do you still need this?
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