Question about Bushnell NorthStar 78-8890 (300 x 90mm) Telescope

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Zoom Hi, I got this telescope today and has no idee how it works. I set it up but dont know how to find the first 3 stars and when I find them, how to zoom

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Re: zoom

All goto scopes require you to do an alignment on 2 or 3 stars in the night sky-- or they will not find anything. Also the time, date, and site must be accurate-- and the tripod must be perfectly level.

Read the manual again-- and perform all of the setup steps. You can download a monthly star chart here for free:

The alignment stars are ALWAYS the brightest stars in the sky and the first ones you can see when it starts getting dark.

Posted on Aug 02, 2011

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I used the collimation eyepiece to collimate my telescope.But I dont know if it's properly aligned. The knobs on the bottom of the tube are turned fully clockwise, and the black dot in the eyepiece is...

Before you do anything else, take the scope outside on a good night, find a semi- bright star (Polaris will do). Let the scope cool down! (about 45 minutes) use your highest power eyepiece and put the star in focus.
Now take the star out of focus (inner focus or outer focus) you should see a dark circle in the center with symmetrical rings around it (airy rings). If the dark circle is in the center and the airy rings are symmetrical, your telescope is collimated
Check both inner and outer focus, they should be close to the same. If not you should re-collimate.
Best done with fainter stars but for now stick to the brighter ones.
Because I own 3 scopes, I use a Hotech laser collimator. its quick and easy. Worth it if you travel with your scopes to dark sites

A good guide on how to collimate

Oct 16, 2010 | Celestron NexStar 130SLT (31145) (306 x...

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How I know the red dot is working ok, is

This is a 60mm telescope not much bigger than a 10x50mm pair of binoculars. Your maximum magnification will be about 100 power. Yes I know they said 200-300 power on the box. This was a lie.

Do not use the 2x barlow. Probably be just too much magnification. Put the eyepiece with the largest number written on it into the telescope; then try the same eyepiece with the 1.5x barlow. That is probably all the magnification the scope can handle.

Stars are always pinpoint light sources, no matter how large the telescope. They are hundreds or thousands of light years away.

The "red dot" should be pointed at exactly the same spot as what is in the eyepiece. Center a bright star in the eyepiece, then without moving the telescope... center the red dot on the star. Now you can use the red dot to POINT the telescope exactly to a sky object.

This web site may also help you:

Dec 28, 2009 | Konustart 700 (120 x 60mm) Telescope

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When i initially set up my telescope how do i know that i set in the correct stars in the initial set up?

They always pick the brightest stars for alignment stars.

You will need to learn a few stars in the sky. All you need is a monthly free star chart like the one below.

On the more expensive Meade telescopes you can press the "?" key it it will NAME the star it is looking for.

Dec 16, 2009 | Meade Telescopes

1 Answer

Hi, I have assembled my telescope, i can see through it in the day..but at night even though it is a full moon, it gets difficult to get a clear picture. The manual says you can see lots of stuff with it,...

You have a 3-4 inch reflector. DO NOT USE the 2x barlow. It creates too much magnification for that small telescope.

Put the eyepiece with the largest number written on it into the telescope and then try again.

Objects in the sky are very tiny. The scope must be pointed directly at them to see them.

Download a free star chart here:

and try to locate a local astronomy club to get help with locating sky objects.

Oct 22, 2009 | Telescopes

1 Answer

Celestron NexStar alignment problem

Several questions-

1. Are you SURE you are choosing the correct alignment star?

2. Are all the settings correct like-- Location, Time, Date, Daylight savings time.

Jun 18, 2009 | Celestron NexStar 102 SLT 102 mm (4.0)...

1 Answer

Celestron astromaster 114 EQ (problems zooming in)

Most telescopes do not have a zoom-- they have different numbered eyepieces that give different magnification-- you can buy a zoom eyepiece however.

From what you describe -- put the eyepiece with the LARGEST number written on it into the telescope-- this is the LOWEST magnification. Now focus on the moon and or a distant land object during the day-- once it's in focus -- nice and sharp-- replace the eyepiece with the next LOWER number-- for more magnification. AND-- refocus the telescope for that eyepiece.

Feb 11, 2009 | Celestron AstroMaster 114 AZ (50 x 114mm)...

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Cant see anything

Well you -- like hundreds of other people-- bought a department store telescope. Put the lowest power eyepiece in the telescope-- it's the one with the LARGEST number written on it.

Practice focusing during the day time on a distant object. I know the box said 500 power BUT you will only get about 100 power or less maximum that you can actually use.

Dec 27, 2008 | Vivitar (1607225) Telescope

1 Answer

GoTo Problem

Be sure that the telescope is configured for EQ SOUTH mode to tell it is in the southern hemisphere. Once a star alignment is completed NEVER manually move the telescope. Use only the control panel to slew. Everytime the telescope is move by hand, the motors do not know it has been done, and assume it is still pointing at the old direction. Check the manual for setup.

Apr 06, 2008 | Celestron NexStar 130 SLT (306 x 130mm)...

2 Answers


By doing this trick--

Do a FAKE alignment-- (I assume that the scope is trained and has the proper date, time, and site)-- just push the buttons for the alignment stars that you cannot see. Then do a GOTO to a star that is in your field of view--- center the star and SYNC. Your gotos will now be OK in your limited field of view.

Jan 30, 2008 | Meade LX200R 8 in. (600 x 203mm) Telescope

1 Answer

Storm 60 telescope

The only way you could zoom in or out on this telescope is if you get a telescope-camera with zoom capeabilities.

Nov 12, 2007 | Meade Infinity 114EQ-DH Telescope

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