Question about Celestron NexStar 5 SE (300 x 44.45mm) Telescope

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Black spot in the center of the image viewed in telescope

I see a black spot in the eye piece when a viewing a star

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  • Anonymous Dec 14, 2008

    Celestron NexStar 5SE

  • nabdurrahman Jan 29, 2009

    Its a catadioptric Celestron NexStar 5SE.

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If this is a Newtonian reflector or a catadioptric scope (Schmidt Cassegrain or Maksutov) you may be trying to use it at too low of a magnification. Your magnification needs to be high enough that the exit pupil is less than 5 mm; to figure this divide the focal length of the eyepiece by the f-ratio of the optical tube. If this quotient is 5 mm or more the black spot you are seeing is the shadow of the secondary mirror.

Posted on Jan 28, 2009

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What type of telescope are you using?

Posted on Dec 14, 2008

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1 Answer

I can't see through the eye piece! The finderscope has been adjusted to view the moon but when I looked through the eye piece I could only see black :( its a tasco galaxsee 45-076280


Align the finder to the main scope during the day before using it at night. Use the lowest power (biggest number) eyepiece first.

Mar 10, 2014 | Telescopes

1 Answer

We had the 20mm eye piece in and we turned the focus all the way clockwise so the eye piece was all the way in. We had the cover off, we had a very clear starry night, we live in the country, moved the...


First find a local Astronomy club -- the members will help you.

Second, you must first align the red dot finder with the main tube-- there are knobs on the side and bottom (usually) to move the red dot. Point the scope at the top of a telephone pole in the distance during the day time-- wget the top in the center of the eyepiece of the main tube. Without moving the main tube adjust the red dot so it points at the exact same spot.

Turning it all the way in or out is NOT how you focus-- there is a small "spot" when the eyepiece is in focus, and every other eyepiece must be refocused. Turn the knob slowly until the star or the moon comes to sharp focus.

Read my tips on my profile page.

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

Jul 04, 2011 | Celestron AstroMaster 114EQ (100 x 114mm)...

1 Answer

Hi, a few days back I purchased Nexstar 4SE. I set it up exactly how it says in the manual still I cannot see any magnifying views from the eye piece. While aligning the telescope I can find the moon from...


Stars will always appear as points. It is not possible to magnify them enough to see them as disks because they are all extremely far away. A telescope will however show you stars and other objects that are too dim to see with the naked eye.

You will be able to see the planets as disks, and even features on the planets, such as the bands on Jupiter, the rings of Saturn and the phases of Venus, and also moons around some planets. There are other objects that will show more detail when magnified, such as nebula. You will be able to see a lot of craters and other detail on the Moon.

Your problem is simply that you are not pointing the telescope at these objects. This seems to be one of those telescopes that "automatically" finds objects, but these so called "go to" scopes only do this when they are set up properly. I can't say what step(s) you have missed, but clearly even if the scope thinks it is pointed at the moon, if you can't see the moon, it is NOT pointed there. The Moon will fill the field of view even with the least powerful eyepiece. If you are seeing stars as points, then the eyepiece is focussed and working properly.

Jan 13, 2011 | Celestron NexStar 4 SE Telescope

1 Answer

I cannot see anything, just blackness... i have removed the lens-cap and put in the eye-piece as well as the front dust cap but all i see is black, also the red finder is not helping me aim.


Use the eyepiece with the LARGEST number written on it. Practice focusing on a distant object during the day time. You must adjust the red dot finder to MATCH the view in the main tube.

Point the scope at a distant telephone pole, and without moving the main tube adjust the red dot so it lands on the exact same spot. DO NOT use the 2x barlow if you have one.

Dec 26, 2010 | Telescopes

1 Answer

When viewing venus or other stars there a black spot in the center of the object. It appears to be the 2nd mirror refleting to the main miror. what have I done incorrect?


You are NOT in focus. Turn the focus knob a little until you see a perfect "disk" for the planet. Stars are always POINTS of light, with a telescope or without a telescope.

Aug 28, 2010 | Celestron NexStar 114GT (269 x 114mm)...

1 Answer

I have an Orion SkyQuest XT8 Dobsonian. I have had it for 6 years or so. I can't see anything through the eye pieces. It just has black spots. is it the eye pieces or the telescope?


Put the eyepiece with the largest number written on it into the focuser. Go outside during the day time and practice focusing on a distant object.

Watch this video --
http://www.andysshotglass.com/Collimating.html

May 11, 2010 | Orion SkyQuest XT8 Dobsonian Telescope

2 Answers

Telscope eye piece


Eyepieces are for the most part interchangeable. Your scope will have a focuser on it in one of 3 diameters. 2", 1.25", and the rare .965". Most inexpensive scope will use a 1.25" eyepiece. 2" focusers are usually found on more expensive scopes used for astrophotography due to the increased field of view with the larger diameter. Plossl eyepieces are fairly inexpensive and are good for all around use. I would suggest getting 2 one at 25mm or greater and one around 9mm. http://www.telescopes.com has a large selection however their are many suppliers out there. Good luck and happy star hopping

Jan 01, 2008 | Telescopes

1 Answer

Black dot.


Ensure focusing is spot on. if your image is a black dot surrounded by white light (like a doughnut) then your not in focus. Look at making a Hartmann Mask (really easy, just google for it), which fits over the front lens. It has 2 or more holes in it,this means when you look through the eye piece you will see double images, adjust focus until the images merge into one (if the images go further apart turn the focuser the other way), when they are merged remove the mask and presto you should be in optimum focus. Always remember telescopes are very sensitive and focussing requires delicate adjustments.
Regards and Clear Skies
Carl

Dec 26, 2007 | Celestron NexStar 4 SE Telescope

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)...

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