20 Most Recent Celestron Advanced C10-NGT (600 x 254mm) Telescope Questions & Answers

First -- how do you know the mirror needs cleaning? Did you shine a flaslight down the tube and see some dust? Never use a flashlight to determine if a mirror is dirty-- they are ALL dirty when you use a flashlight to check them.

Only clean the mirror if it is interferring with the views through the scope.

There is a ring around the back-- remove those screws and the mirror should come out-- don't driop it! Then remove the mirror from the mirror cell.

Sometimes certain cameras will NOT come to focus, especially in short tube reflector style telescopes. There is not enough back-focus to achieve focus.

Did you remove the lens cap? If the scope is like the picture in your question this is a REFLECTOR style telescope. It has a mirror in the bottom and a smaller secondary mirror under the focuser. The FOCUSER end is pointed UP. as in the picture above.

Can you focus on a distant object during the day time? Use the eyepiece with the largest number written on it and DO NOT USE the 2x barlow if you have one. Try focusing during the day time. If this works your telescope is OK. Then try the moon at night as your first target.

If you can see the moon up close all is OK.

Read my TIPS on my profile page.

Holy man.. response is kinda slow. Good thing I tried it myself.

Sure as heck, you can leave the Right Ascension and Declination clamps tight while using the motors!
It makes a lot of sense, and many things much easier....
Thanks for the.. reply? lol. Just joking.

=)

Question moved from Televisions category. Celestron Support https://www.celestron.com/pages/support Setup videos https://www.google.com/search?q=celestron+lcm76+setup ..

The Celestron manual for this scope has nothing to say, but on the underside of the focuser assembly, between the 2 focus knobs, you may see 2 screws.They might be thumbscrews or some other screwhead type. One is the adjustment for the focuser internal clearance, or looseness, and the other is a focus travel lock.If present, try backing both off 1/2 turn from tightness, and then experiment to see which is which. The focus lock will have no effect until tight, when the focuser will cease moving, as is now. The other screw will gradually remove looseness and rattle from the focuser until it just moves smoothly, with no back and forth loose feeling at the knob.If neither of these screws is visible you will have to take it to a binocular and telescope shop, where they should not charge much.

topbestjob.com

Why not look at the old battery, or look in the manual ?

It is impossible to assess the weight (or more correctly Mass of a star, as weight is a perceived function of Earth's gravity) without knowing the chemical make up of the star. That is why astronomers use the star's measured albedo to qualify and quantify them.

Read the manual. Follow the instructions therein.

You may find you have to aim it at the sky yourself - sounds as if the calibration may be 180 degrees out

I WOULD CONTACT THE MANUFACTURER ON THIS.

Have you looked in the manual ?

Most problems will be overcome by reading and absorbing the instruction manual. Assuming the telescope is in good order, it must first be pointed at a light source using the spotter scope and then aligned using the lowest power eyepiece before fitting the high powered eyepiece... You also should be in very low light conditions.

Do you mean resolving power or magnification power ?