joseag285

Final update (probably): I took out the primary mirror again and realized I hadn't bothered to check the back part of it and I found this. I thought being cracked behind the reflecting surface wouldn't be an issue, but now I'm pretty certain this is what's causing the shadow on the light. The cracked area shape even looks similar to the shadow's shape. I rotated the mirror to see if the shadow will appear on a different quadrant, but I still haven't had clear skies to test it. Honestly I'm thinking I should make the upgrade already and get an 8" Dob instead of trying to replace the inferior spherical primary mirror for this telescope. However since I live outside of the US, shipping costs and VAT will increase the cost of the telescope by about 70% 🥴

No, the corrector lens is held tightly in place by a plastic ring that screws on top of the lens. I took it out yesterday to see if the lens had moved but there's really no way for that to happen. No more deep sky observing for her 😆😡

Update: Last night I took out the focus draw tube and checked the corrector lens, but it looks perfectly fine and smooth to me. I tried collimating it without the corrector lens but it was nightime so I didn't get it quite right. The shadow spot still appears though 😕. The focuser tube seems to be in perfect condition as well, nothing out of the ordinary. Honestly I think this might be something to do with my secondary being weirdly tilted. I'll keep on trying to collimate during daytime, but for now I'm pretty bummed that nothing seems to work.

@Peter Drew Thank you for your answer. I was just thinking last night if it had something to do with the focuser tube as well. I'll see if I can take it out tonight and look into it. @Bruce Leeroy You might be on to something. The picture I took and posted here has the focuser tube mostly racked all the way in. However, when I take it out past the focus point, I've noticed that the shadow is not visible anymore. This would explain why the shadow appears on the same quadrant always. Also, I believe that quadrant is exactly the one where the focuser tube protudes inside of the telescope tube. @Bivanus I still haven't messed around with the focuser tube, but based on the other responses, it's very likely that that's causing the problem. As for the articles, I'm quite aware that some people hate this telescope. However, I think it's a great beginner's telescope as long as you respect its limitations and also buy some good quality eyepieces and accesories. I've taken some really great pictures and seen different deep sky objects with it, so I'm honestly pretty happy with it (except right now with this problem I have 🤣)

Hi, Last year I bought a Celestron 127 EQ Telescope. I have enjoyed using it and I have learned pretty well to collimate it quickly and never had any problems with it. However, a few weeks back my cat somehow managed to drop the whole thing and it hit against the floor pretty hard (seeing it on the floor hurt me so much lol). Luckily, nothing was broken. Both the primary and secondary mirrors are fine, but they obviously moved around when it dropped. However, after collimating it back and doing a star test, I noticed a weird spot on one of the "quadrants" of the light. I've attached a picture of this below. No matter how perfectly I seem to collimate it, I always get this spot on the same quadrant, even when I purposefully uncollimate it. This makes it impossible to focus the star or planet since there will be a huge coma on it. I have tried removing and putting back in the primary mirror evenly but it doesn't seem to work anyway. As I mentioned before, I am well used to collimating my telescope, but this weird spot is a first for me. The only thing that comes to mind is something to do with the focuser tube being crooked after the fall. I would appreciate any help or suggestions from people who have seen this kind of spot during observation.