Question about Bushnell NorthStar 78-8846 (675 x 114mm) Telescope

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User manual & info to order lenses

I'm giving the telescope to my grandson and would like to obtain the manual so he can use it properly. Also this would give him information to order more lenses.

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You can find a manual at this web site:

Look down the page for your telescope model:
http://www.opticsplanet.net/bushnell-warranty.html

Posted on Dec 11, 2009

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I need a users manual which tells me how to observe things through the eyepiece.


There are probably several good books on astronomy which you may obtain from your local library that could give the information you require, but I doubt if there is one specifically for your telescope. Have you tried contacting the mfrs or importers to see if they can assist you ? After all, it is in their interest to ensure you are satisfied with your purchase.

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I rescued a celestron Skymaster 60AZ from the local council waste tip. all lenses are good scope and tripod minus a few screw/bolts which i can fix. But it will not produce a focussed image unless I extend...


Do you have a "diagonal" with this small telescope? It looks like this:
http://www.amazon.com/Orion-1-25-Prism-Telescope-Diagonal/dp/B0000XMWYY/ref=sr_1_4?ie=UTF8&qid=1313867352&sr=8-4

Put this into the focuser and then put the eyepiece into the diagonal. That all there is to it. If you are just putting the eyepiece into the telescope without the diagonal --- then you will need to OVER extend the focuser in order to come to focus as you described.


www.telescopeman.org
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Have a tasco starguide St-41325CT D=102mm F=1325mm coated optics have been trying to find the user guide. Cant seem to come up with this one any help you can give me would help. Thank you.


You won't find a manual for those small telescopes. However Meade maintains a web site for their scopes. Look around the page for one similar to your telescope and download a manual.
http://www.meade.com/manuals/index.html

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Try this web site for a manual: http://www.meade.com/manuals/index.html.

I did not see the part number 76700 listed but they had several Telstar models listed and did not always show the part number, instead opting to show the model number. If the exact one is not listed, you might find one very close to it.

I hope this helps.

-jodair

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Misplaced lenses


You don't need to get Vivitar brand eyepieces to get replacement ones for your telescope. I'm not sure of the specifications for this particular telescope but in general they come in two barrel sizes for the eyepieces. The diameter of your eyepiece is probably 0.965" but could come in the more standard 1.25". You can measure the diameter and determine this quickly.

Once you know the diameter to shop for you can look for the focal length of the eyepiece you wish to purchase. They are rated such as 4mm, 10mm, 25mm, etc. The smaller numbers give you higher magnification. You can calculate the magnification by dividing the telescopes focal length by the eyepiece focal length. For example, let's say your telescope is has a focal length of 360mm and you have an eyepiece rated 10mm. Divide 360 by 10 and that gives you a magnification power of 36.

You can find eyepieces at many telescope dealers on the internet. Your selection will be far less if you use 0.965" eyepieces. You can purchase 0.965" to 1.25" adapters so that you can use the larger eyepieces with your telescope. However, on some telescopes the adapters will cause the new eyepiece to not come into focus.

You'll also find that eyepiece prices go all over the place. A good general purpose eyepiece is a type called the Plossl. The better eyepieces have more coatings too that allow more light to get through to your eye. You'll find these listed with terms like "fully multi-coated".

I hope this helps.

Good luck and clear skies!

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Practice focusing during the daytime on a distant object at least 100 yards away.

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All of Bushnell's manuals are on this web site. Look down the page for your telescope.
http://www.opticsplanet.net/bushnell-warranty.html

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1 Answer

Tasco


All of Tasco's manuals are on this web site:
http://www.tasco.com/pages/instruction-manuals/



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