Question about Bushnell NorthStar 78-7860 (563 x 60mm) Telescope

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How do you align the 78-7860

A friend brought us this scope to see if we can get it to work. First step is to align the tube. The manual doesn't really have instructions on how to do this. Can't get past step one until we can do that. Thanks. Lloyd

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Align the small finder scope with the main tube. During the day time point the scope at at the top of a telephone pole and get the top centered in the eyepiece on the main tube. Then without moving the tube adjust the crosshairs or the red dot to point at the exact same spot.

www.telescopeman.us
www.telescopeman.org
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Posted on Jul 09, 2011

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I have a celestron Cosmos 90 GT Wifi telescope and so far haven't been able to use it. I struggle with aligning the telescope to 3 bright stars... if by chance it says its aligned when I choose a star


Aligning a scope requires several things to be correct.
1. You must follow the setup in manual 100%
2. You must pick the correct alignment stars. Most failed alignments are because you aligned on the wrong star. So alignment requires you to learn the names of a few bright stars and be able to spot them in the sky.
3. With many goto scopes there might be a "home position" to start the alignment. For example, tube pointed roughly North, and level. Check your manual for a "home position. Also time, date, and site must be correct.

Clear skies,
TelescopeMan
www.telescopeman.org and www.telescopeman.info

Feb 16, 2015 | Celestron COSMOS 90GT Wi-Fi Refractor...

Tip

You Just Bought an EQUATORIAL Telescope Mount!


Even though we warned you not to do this, you bought one anyway! Beginners should never buy an EQ telescope mount as their first telescope. It's too late now; so I guess we will need to teach you how to use it!

Equatorial mounts move in a way that seems not to very intuitive. Unlike the easy Alt AZ mount which moves up and down and left and right, the EQ mounted telescope seems to move in TWO dissimilar directions at the same time.

Additionally you must first polar align the mount on the North star Polaris before you can use it. SEE! we told you not to buy it!

Here are the steps to roughly polar align the telescope so you can use it. If it is motorized the single Right Ascension motor will keep the sky object inside the eyepiece for long periods of time. If you do not have a Right Ascension motor, the slow motion RA knob can be slowly turned to keep the sky object centered in the eyepiece.

Begin by leveling the mount and tripod. Move the entire mount and tripod so it is pointing roughly to North, as close as possible using the steps below or a compass. Don't forget to adjust for your magnetic deviation. My location's compass reading is about 5 degrees away from true North. This is called magnetic deviation. You can find your location's deviation on the internet. Then proceed with the steps below.

First, adjust the Declination to the latitude for your observing site. Declination is the angle that the scope is pointing UP, and it's the same as your latitude. For example Dallas, Texas is about 32 degrees North latitude, adjust the scope so the small indicator reads 32 degrees. By the way, the North star in Dallas, TX is about 32 degrees above the horizon. Your latitude matches the elevation of Polaris (the North star) above the horizon.

Second, either look through the polar alignment scope buried in the axis of the telescope mount, or look along side the axis, and get the star Polaris lined up in the cross-hair of the polar alignment scope, or as best you can by looking along the side of the mount axis, or lining it up using your compass.. This will put the scope to within about 3/4 of 1 degree of the TRUE North celestial sphere. This is good enough for VISUAL observation, but NOT good enough to do astro-photography..

Adjust the DECLINATION up or down, and move the entire mount left or right until you can see Polaris as indicated above, or it is lined up as close as possible.

Now you are roughly polar aligned. Now you can move the tube around by loosening the Right Ascension lock, and or the Declination lock until your sky object appears in the small finder scope mounted on top of the main telescope tube.(DO NOT MOVE THE MOUNT, and the counter weight should never be higher than the telescope tube) Lock down the scope in both axis and use the fine adjustment RA and DEC knobs to center the target. Again, DO NOT move the mount or tripod. The mount should still be pointing at Polaris.

This web site illustrates this procedure:
http://www.astronomy.net/articles/4/polaralign.html

also this web site

http://www.telescopes.com/telescopes/polaralignmentarticle.cfm

You should be able to keep an object within the field of view of the eyepiece by slowing turning the Right Ascension slow motion control knob-------- IF you are actually accurately polar aligned. Small adjustments may also be needed with the DEC slow motion knob since you are not exactly polar aligned using this rough alignment technique.

However it can be used successfully for visual observation. Your scope will now track the motion of the stars as they move across the sky.

Hope that helps you!

Clear Skies!
TelescopeMan

www.telescopeman.tumblr.com

on Dec 29, 2009 | Optics

1 Answer

We have a bushnell 78-8831 telescope, after assembly we still cannot view any images.


1. use the lowest power eyepiece (highest number in mm)
2. Point the scope towards a object (about 1000yds) away during the day and see if you can focus on the object. If you can not see anything during the day there is a problem either with the scope or set-up
3. Align the finder to the daylight object so it is ready for night viewing.
4. First night object should be the moon. Easy to find. ( A full moon presents poor seeing but this is just to get used to the scope.
5. Once the above steps are completed, use a good star program to find interesting objects (Stellarium, Cartes du Soliel, C2A are all freeware)
6. If you can not see the daytime object, remove the eyepiece and look down the focus tube. You should see a reflection of your eye in the primary mirror. If not, the primary and/or secondary mirror need to be collimated (aligned) refer to your owners manual.

Jul 12, 2011 | Bushnell NorthStar 78-8831 (525 x 76mm)...

1 Answer

When I have my 8mm or 4 mm all I see is black. any suggestions? with the naked eye I can see stars and with the aiming scope I see them but through main eyepiece I see nothing.


The finder scope must be aligned with the main tube. Get a bright star into the MAIN tube eyepiece. Then without moving the scope adjust the crosshairs in the small finder scope so they CROSS at the same star.

Mar 27, 2011 | Vivitar Optics

2 Answers

Need owners manual for Venture RX-7 telescope


You will not find a manual. BUT you do not need one.

This is a very simple reflector telescope on an Equatorial mount. The mount must be polar aligned in order to properly use the scope. Read my TIP in my profile section about aligning an Equatorial mount.

The major steps are:

Align the small finder scope with the main telescope tube on a distant object.

Set the Declination axis to your Latitude.

Align the main tube with the axis of the mount.

Point the entire mount toward the North Star Polaris.

Use the fine RA & DEC knobs to center Polaris in the eyepiece.

See this web site and my tips--
http://www.astronomy.net/articles/4/polaralign.html

This is why we NEVER recommend an EQ mount to a beginner. Polar Alignment just introduces one more FRUSTRATION to someone new to the Astronomy hobby.

The eyepieces simply go into the focuser. The Larger the number written on the eyepiece the LESS the magnification.

Take the scope outside during the daytime and practice focusing on a distant object using the eyepiece with the largest number.

The manual WILL NOT tell you how to find those small dim objects in the sky. It's just assembly instructions.It does not tell you how to become an amateur astronomer.

Locate a local Astronomy club and seek advice from the members, who will be glad to help you with your telescope.

Buy these two books available on amazon.com

Turn Left at Orion

and

Nightwatch

Read my tips on my profile page, and read this:
http://www.texasastro.org/telescope.php

Aug 11, 2010 | Optics

1 Answer

Lost my manual


You have a 60mm refractor telescope on an equatorial mount. First the mount must be polar aligned in order to useit. Second I believe these take .965 eyepieces. Most amateur scopes use 1.25 inch eyepieces,

The eyepieces are very cheaply made. Some may also have plastic lens instead of high quality glass, and they are not muti-coated lenses.

Why am I saying all this? because this scope will frustrate you. The tripod is shaky and the connection between the mount and the scope tube is never solid. The scope will not stay pointed and it will be difficult to move it around the sky accurately. Sky objects are very tiny. Less than the tip of you finger held at arms length!

We never recommend an EQ mount to a beginner, and never recommend a 60mm telescope. You could have bought a pair of 10x50mm binoculars and they would have been much better for astronomy.

The manual will NOT teach you how to polar align the scope or how to find objects in the sky.

Read my TIPS on my profile page Frequently Asked Questions, and also the one on aligning an equatorial mount on the star Polaris.

This is the only manual I have ever found-- someone took images of the manual and posted it on-line-

here:

http://www.flickr.com/photos/7788977@N08/sets/72157610357951752/



Jul 21, 2010 | Tasco Astronomical 302675 Telescope

2 Answers

I need a users manual for tasco galaxsee 46-060675


Do you need a users manual to ASSEMBLE the scope? Or are you looking for how to USE the scope.

This is a very small 60mm refractor on an equatorial mount. Not much bigger than a pair of 10x50mm binoculars. The binoculars would have been better for sky observing! The euitorial mount must be polar aligned with the star Polaris before it will work properly. We never recommend equitorial mounts to beginners for this reason.

Please read my TIPS in my profile page to learn how to polar align the scope, and what you can do to improve the scope.

If you need a manual for assembly you will not find one for Tasco BUT Meade has a similar scope. They all assemble in the same way. Here is the Meade Manual:
http://www.meade.com/manuals/m285/index.html

Jan 23, 2010 | Tasco Optics

1 Answer

150-1400 Newtonian telescope Set the sight scope eye piece on the moon and looked in the pl 25mm lens in the focusing tube and no image? Can anyone help Philip moondogs2@myway.com


You must align the finder scope with the main telescope tube--

During the daytime look at something far away in the main scope-- without moving the scope center the cross hairs on the finder scope.

Good luck

May 04, 2009 | Optics

1 Answer

Cannot find a planet?


you need to align your finder scope with the main tube see how to do this here http://www.scribd.com/doc/11827347/Tasco-Telescope-Manual

Sep 13, 2008 | Tasco Luminova 40114675 (675 x 114mm)...

1 Answer

Bushnell telescope 78-9669


You must first learn how to focus it in the day time. Put the eyepiece with the largest number written on it into the focuser-- do NOT USE the 2x barlow if you have one. Practice focusing on a distant object. The red dot FINDERSCOPE must also firt be aligned with the main tube -- it is used to POINT the scope at an exact spot in the sky.

Objects in the night sky are tiny and the scope must be pointed directly at them to see anything. Locate a local Astronomy club and they will help you. Also read the manual completely.

www.telescopeman.org
www.telescopeman.us
www.telescopeman.info

Jul 13, 2008 | Bushnell 78-9669 Telescope

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