LoloCoAstro

Hello evevrybody Someone knows if it exist a optical reducer focal to the 8" F/12 ?

Thanks @johninderby, I think that you exactly undestood my problem. The element with 3 pairs of screw on the back of the scope look like to this tiltin adapter flange. That's why I believed it. Thanks so much. Next time I'll try to adjust the primary mirror too.

@johninderby, Thanks. I have this manuel. But i don't undestand. The "Optical Axis (Primary Mirror) Adjustment" don't work on the primary mirror directly, but on the axis of extension rings and focuser. Are you alright with me ? My question is: when we adjust the optical axis, the position between secondary mirror and primary mirro is it différent or is it the same ? So, the position of extension rings and focuser change from mirrors ?

Last days, I try to adjust the collimation of my telescope. But I don't understand somethings. When I use 3 screws on the secondary mirror, it's possible to adjust the collimation. But is it possible to adjust the primor mirror ? Behind the telescope there is 3 pairs of screws. How do these screws work ? Do they adjust the primor mirror or adjust the axe of the focuser ? I ask you this because, when i adjusted the colimation, last time, I saw a little astigmatisme. Do you know how to remove this astigmatisme, or decrease it ? Do you tested it ? Do you have some information to help me ?

Hi, I use my telescope with the diagonal, two days ago. It's ok ! Thanks again about your help. I's very kind

I just received my diagonal and an other spacer. Now I wait à Night without cloud !!! And I will try to adjust a good focus and a good picture on eyepiece. thanks again

Ok. Thank so much. But if I want put a CCD camera, have I a good enough track focus with 3 spacer (25+25+50) ? i think that I will try it the next night.

Hi everybody. @johninderby I would like some help please. I just buy this telescope (GSO 8" F/D12). But it was very difficult to use it to watch something. I explain my problem: I can't ajuste the focus to have a good image. I use an eyepiece (7, 10 and 25mm). But I can't adjust a good focus. I use 2x spacer M90 1" + 1x spacer M90 2" and focuser. But I need to move the eyepiece back. And with the 7mm eyepiece it's almost impossible. I d'ont have a star diagonal. What do you mean about this problem. I'm crazy or not ? How to do adjust focus ?

Hi everybody I'm a new beginner from France. I comeback in the astronomy world after 15 years. I didn't watch in a telescope during 15 years. But now I have pleasure to watch again and again and again too !! I would like to watch planets and take some picture with APN and CCD caméra. I hope to the new experience of astronomy world will be fun. See you soon. Laurent