Guide :Optics : NexStar 4 SE Telescope

Black dot. Why is there a black dot on every star i look at. Please help i am a beginner with telescopes

Posted by Chrisss on Dec 26, 2007

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Suggested Questions And Answer :


Black dot. Why is there a black dot on every star i look at. Please help i am a beginner with telescopes


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
Read More At : NexStar 4 SE Telescope...

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 StarPointer but when I look in the eyepiece I can't see moon. When I look at stars from the eye piece they just appear like a tiny dots (just like they appear to naked eye). I am confused what step I am missing here. Or it it possibility that the eye piece is a defected piece? Please help!! Thanks,Neha


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.
Read More At : NexStar 4 SE Telescope...

I have the Nexstar 8. It will not auto align or manual....


You must set TIME, DATE, and SITE-- probably does not know your actual location. Read the manual and perform all of the setup procedures. Some of these have a "starting position" again read the manual and make sure you are in the "home" position before you start the alignment. Read my TIP on my profile page about GOTO telescopes, and join the NEXSTAR forum on www.cloudynights.com
Read More At : NexStar 102 SLT 102 mm (4.0) Refractor Telescope...

Dot in view


Sounds like a collimation problem!! do you know how to collimate the optics?
Read More At : NorthStar 78-8846 (675 x 114mm) Telescope...

Viewing we cannot view the planets or stars. the moon comes in great, but anything else looks identical which is a white circle with a black center and 3 black lines goinging through it in the shape of a peace sign, help please, I have contacted the 800 number for the product, they have no idea. my telescope is not on your list. it is northstar goto model 78-8831 76mm reflector.


Take it back where you got it for replacement
Read More At : NorthStar Goto 100mm 788840 Maksutov-Cassegrain Compact......

Just got a celestron nextstar 5


You are NOT in focus. You are seeing the central obstruction in the lens on the front of the tube. Put the eyepiece with the largest number written on it into the telescope. Go outside during the daytime and practice focusing on a distant object.Once you are focused properly you can see the obstruction.Read my GOTO scope TIps on my profile page.
Read More At : NexStar 5 SE (300 x 44.45mm) Telescope...

Cannot see through lense


A telescope only shows about 1 degree or LESS of sky-- this about the size of the tip of your finger held at arms length! Point it at the moon and practice focusing the telescope.
Read More At : Galaxsee 45-114375 375X (375 x 114.3mm) Telescope...

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