Celestron Optics - Answered Questions & Fixed Issues

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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.

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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 ?

Do you mean resolving power or magnification power ?

Please do so

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.

With the setup you have, you are attempting a magnification of x 750, which is way beyond the capabilities of your scope. A realistic limit to usable magnification is x 250, or about what you will get if you take the barlow off and just use the 4mm lens.The 127mm aperture on that scope does not gather enough light to do more. Even that depends on good seeing, that is, clear air and no light pollution. It is a great shame that scopes are marketed with outlandish claims as to magnification. You certainly will see a magnification of x 750 in daylight, when there is lots of light, but they don't tell you that trick. I have a 200 mm scope, with a practical limiting magnification of x 400, and I find that almost impossible to use. The viewing object is hard to find and keep centred in the eyepiece, it wobbles around, it soon disappears due to the rotation of the heavens, and is dim and blurry. I keep to magnifications of about x 250 max. .

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Use the finder scope to locate the object in question, then main scope will be aligned for magnified viewing.

Go on Celestron's web page to see if you can get them there.

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Assuming the altitude clutch is tightened, the next thing I'd check is the power supply. All these scopes behave weirdly if the supply is borderline. If you are using dry cell batteries, go to a mains supply or a lead acid gel type rechargeable battery of at least 10-12 Ah