Sorry for the ugly title. My dad recently bought a cheap astrotelescope online, and we are yet to get it to focus on ANYTHING at all. Here is what I know: it’s a refractor type astro telescope, with a focal length of 700mm and a lens diameter of 70mm. It features a finder scope, 3 eyepieces (20mm, 12mm and 5mm), and one extension and one barlow tube. I’m attaching images for reference.
I’ve assembled everything and I’m trying to get a look at some buildings which are pretty far away (>1km). With no eyepiece, I can see the target through the finder and through the tube of the telescope, out of focus of course but it’s there. However, with the 20mm eyepiece attached I’m moving the focusing tube back and forth with the screws which control it but nothing is changing as I look through the eyepiece, image remains totally blurred.
I’ve opened the front lens to see if there is some protective plastic there to remove, and I’ve discovered that it’s made up of two lenses and a plastic ring between them. One of the lenses is convex on both sides, and the other one is only convex on one side. I’m thinking maybe they assembled them the wrong way around in the factory or something, from what I’ve seen online the double convex lens is on the inside, then the ring between them, then the other lens with the convex side facing outwards, is that right?
That’s all of the info I can think of at the moment, if there’s anything else that might help diagnose the issue then please let me know.