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It may not have shipped with an eyepiece, some scopes don't. They would have been junk anyway LOL. This part is interchangeable and removable. The suggested solutions that will appear below are older but accurate.
If the batteries are fresh, are they in correctly? If they are not fresh, try new ones. Roll them a little bit as you put them in to wear through any oxide that may exist on the battery contacts;
You could take it apart, but would you be able to put it back together? Do you have a lens collimator and other gear needed to ensure proper alignment? If you don't have the proper tools, leave the job to a trained professional (or replace the lens).
If it's not on the Optics Planet site then none exist on the internet-- (in English)
Just download one that is similar to your scope-- refractors go together in a similar fashion -- and reflectors go together in a similar fashion.
Or you can find a local Astronomy club and the members will help you. Just about any amateur astronomer can put these scopes together without a manual. In fact the manual only helps with assembly-- it does not tell you how to use the scope to find those small dim objects in the night sky-- and it does not tell you which eyepiece to use or how to focus the scope.
How to use the scope is only learned by practicing and getting local help.
Watch and listen to the audio- video podcasts listed below. Many of them are designed to help beginners with the Astronomy hobby.
This sounds like a reflector style scope with mirrors-
Put the eyepiece with the largest number written on it into the focuser--- do NOT use the 2 x barlow if you have one. Take the scope outside during the day time and practice focusing on a distant object. The end with the focuser on the side is the UP END of the telescope.
We see many beginners with these types of scopes mounted backwards pointing at the ground.
There are only two types of telescopes --- REFRACTORS, and REFLECTORS-
The refractor has a lens on the front of the tube and you insert different eyepieces in the back-- the larger the number written on the eyepiece the LOWER the magnification-- (DO NOT USE THE 2x or 3x barlow which you may have!-- this creates too much power for this small telescope!-- put it away and never use it!)
A reflector has a main mirror on the bottom of the tube, and a small secondary mirror under the eyepiece hole (focuser end) - front end-- put the lowest power eyepiece into the focuser.
Now with either type telescope go out side during the day and practice focusing on a distant object-- turn the knob SLOWLY. At night the moon should be the first target you try.
If you received what appears to be a smaller telescope -- that is the finder scope-- attach it to the top of the tube on the main telescope. Again during the day line up the small finder scope with the main scope-- look at a distant telephone pole (the very top-- and center this in the main telescope. Without moving the main scope use the finder scopes "screws" to adjust the cross hairs so they are pointing exactly where the main scope is pointed. Now you can use the small finder scope to point the telescope in the exact direction--
The moon is big so use the 25mm. The Barlow will have a multiplication marking on it 2x 3x etc. A 2x Barlow lens will effectively double the power of the eyepiece you are using. Do not use the erecting eyepiece for anything other than land viewing. Erecting eyepieces generally reduce the amount of light reaching your eye and thus reduce brightness of the faint objects in the sky. So basically just place the 25 mm lens in the focuser and point the scope at the moon and you will be amazed at what you can see and how bright it is.
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