damjandim

That was my original worry as well, but my father said that when he unpacked it the front lens was already in place and he didn’t touch it, but still couldn’t achieve focus. If you or anyone else here has a correct instruction on how the lenses should be ordered, let me know so I can check. Meanwhile, we put a piece of perfectly fitting PVC tubing between the focuser and the prism/eyepiece and now perfect focus can be achieved both near and really far off (several kilometers away). Still haven’t tried it on any planets/stars since we’ve had rain for almost a month now :(

@Cosmic Geoff @CraigT82 Got it, waiting and hoping for clear skies tonight, will get back to you. Thanks!

@CraigT82 @Cosmic Geoff So I just tried what you guys suggested and here’s what I’ve found out: the two tubes are both with optics inside, one is labeled barlow the other “erection eyepiece”, whatever that means, see images. The erection one has a small lens in the center, the barlow one has a lens on the end which goes in the focuser. I tried putting the diagonal into the focuser and then the 20mm eyepiece inside, moved the focuser all the way out, and started pulling the eyepiece out and there it was, about 10cm from the most extended position of the focusing tube I could see a focused image. I cannot believe they got it this wrong... So, since both tubes I got have optics inside, I will need to purchase an empty extension tube to get it to work?

Yup, tried the diagonal piece and put the same eyepiece (20mm) inside, but to no avail.

Yeah, I have, didn’t make any difference at all. The extension tube actually has another lens inside, I’m not sure if that’s implied. The thing that bothers me is that NOTHING changes when I move the focusing tube, coming from photography this is quite inexplicable to me, I cannot understand what might be the issue.

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.