Question about Celestron NexStar 102GT Telescope

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Scope is burry

Why does the stars or planets look like color particles, is there something wrong with my scope

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What eye piece (EP) are you using? It is much better to start off with a low power eyepiece (say a 25mm - the higher the mm on the EP the lower the power) as a high power EP (say a 10mm) will give a very narrow field of view and will be much more difficult to get things into focus.

Try focusing on a terrestrial object, like a tree top, to get the hang of the focuser and then try the moon. I have an 8SE and it can be fairly finicky on the focus until used to it.

Most of the stars and planets will be little more than dots. You should be able to make out the phases of Venus, the bands on Jupiter and some of its moons and the rings of Saturn, but if you are expecting Hubble type images then sorry to disappoint you.

There are also times when the skies appear clear but due to "seeing" conditions, sharp focus is not possible. Remember we are looking through a few kilometres of moving air.

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Posted on Jan 07, 2013


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I have a T1000HD telescope . I was wondering what I need to do to be able to see planets such as Mars, Jupiter and Saturn's rings. Is it just a matter of getting different eyepieces? If so what kind?

That scope came with a 25 mm and a 10 mm eyepiece, which will give about a x40 and a x100 magnification respectively. If the seeing is good (clear sky, not dusty or windy, and the planet not too low (at least 30 deg up from the horizon) you should get a reasonable view of the planets, with these ep's

If you do not have any ep's you could buy 2 or 3 plossl type ep's (nothing more expensive is justified) of say 10 mm, 25 mm, and 32 mm. It looks like it takes ep's with a 1.25" barrel.

The theoretical limiting power of your scope is about x 220, which is about a 4 mm eyepiece, but at that extreme you will find the viewing object is dim, fuzzy, hard to get into the field of view, hard to focus, and totally frustrating.

Sadly this scope is just not a very good one, sorry to sound elitist. One of the issues will be that of collimation (optical alignment). You can never properly focus the scope unless it is collimated. Reflector scopes (with a mirror) all have this difficulty. You can tell if it is collimated with a star test

There should be 3 screws on the bottom end of the scope, where the mirror is. These are the collimation screws. Have somebody screw these in and out while you look through the ep. Remember you can only assess the collimation when the defocussed star image is right in the middle of your view.

Dec 12, 2016 | Optics

2 Answers

Where can I get one please

Probably almost anywhere that has them on sale - shop around for the best value.

Feb 22, 2016 | Optics

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MI have a 90mm cassegrain gps computer astrophotography telescope. I am able to locate items on the viewfinder/spotter scope but unable to view it thru the telescope, what could i be doing wrong

Your finderscope is NOT lined up with the main tube. Point the scope at a bright star or planet or even the center of the moon. Get it CENTERED in the main eyepiece of the telescope. Then without moving the main tube adjust the crosshairs on the finder scope to point at the same spot.

May 12, 2011 | Optics

1 Answer

I have quite an old tasco telescope. we can see the target star/planet with the finder, but when we switch to look thru the magnification, we see only black. the lens cover is off. dod you ahve any...

You have NOT lined up the finder scope with the main tube. Point the scope at the moon or a bright star and get the moon or the star into the main tube's eyepiece.

Without moving the scope adjust the screws on the sides of the finder scope and center the crosshairs on the target. Now you can use the finder to line up the main tube.

Sep 28, 2010 | Tasco Optics

3 Answers

Why do the stars look like little lights? I kinda

The individual stars are not much fun to look is the planets and nebulas that are. I have an 8 inch SCT with a computer guidence system and have looked at Saturn and Jupiter from my front yard and could see them very well. I live in the city so light pollution will not allow me to see any nebulas. I have to travel outside of the city into the mountains to be able to see things. The spectacular pictures that you see being made by people with telescopes cannot usually be seen by the naked eye through the telescope. They are made using special filters, lenses, and a camera connected to the scope. And then they will have very long exposure times(sometimes 15 hours) to gather enough of light coming from space and taking hundreds of images. Then all these images are stacked on each other and modified using software on a computer to create the images. So again the stars are not much to look at... it is the planets and nebulas that are cool. With my telescope I can see Saturn's rings and moons. I can see Jupiter's big red spot...very cool. You will need to start with a small powered lens to locate the planet you want to look at to center of eyepiece. Then work your way up in magnifiaction by changing the eyepiece and then focusing the inmage in. The eyepiece can make or break your telescope experience and most telescopes come with very limited eyepieces that are cheap and not well made. I have purchased a good set of eyepieces and they make a huge difference. If you can afford it look for a 100 degree eyepiece. They are expensive but are worth it when you look into one. Also it is very important to get your scope's collimation adjusted correctly for the best image. And get yourself a set of color filters. The filters can bring out images that you cannot see without.

Dec 20, 2009 | Meade DS-2114 ATS (325 x 114mm) Telescope

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No problems.

I think sells them. 1-800-421-8047

Dec 14, 2008 | Burris Optics

2 Answers


This is an old problem but I will answer it--

The rattling sound is a KNOWN ISSUE with these scopes. It actually does not affect anything. The scope is what is called an acromatic refractor. ALL ACROMATIC REFRACTORS show color fringing around bright objects. You would need to buy an APOCROMATIC refractor with 3 lenses to get true color correction. These scopes are very expensive to buy.

You can also use a "minus violet" filter to eliminate most of the color fringing in that scope. If the scope cannot be collimated it should be returned to Meade.

Dec 18, 2007 | Meade LXD55 AR5EC Achromatic 5 in f9...

2 Answers

Viewing planets and stars

The problem is you are way out of focus. Turn the focus knob alot, until the star image gets much much smaller. Keep going until it looks like a pin point or a star!. The spider vane and center black dot will disappear. This black dot is actually the secondary diagonal mirror reflection in the primary mirror. The peace signs are the secondary supports. Use the lowest power eye pieces. I would not use the Barlow lens that comes with this scope as it very poor quality. Also, using this high power with this small an aperature (tube diamter) & unstable mount will be very difficult indeed. Invest in some wide angle, long eye relief low power lens. Use these for a while before going to higher powers.

Nov 19, 2007 | Bushnell NorthStar 78-8831 (525 x 76mm)...

1 Answer

Cant find the stars

You need to have the sighting scope and main tube realigned.

Dec 16, 2006 | Barska Optics Barska AE10106 - 900114,...

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