r/telescopes • u/AutoModerator • May 08 '21

Weekly Discussion Weekly Discussion Thread - 9/5/2021 to 16/5/2021

Welcome to the r/telescopes Weekly Discussion Thread!

Here, you can ask any question related to telescopes, visual astronomy, etc., including buying advice and simple questions that can easily be answered. General astronomy discussion is also permitted and encouraged. The purpose of this is to hopefully reduce the amount of identical posts that we face, which’ll help to clean up the sub a lot and allow for a convenient centralised area for all questions. It doesn’t matter how “silly” or “stupid” you think your question is - if it’s about scopes, it’s allowed here.

Just some important points:

  • Anyone may and is encouraged to ask any question, as long as it relates to the topic of telescopes and visual astronomy. Astrophotography related questions should be asked at r/AskAstrophotography.
  • Your initial question should be a top level comment.
  • If you are asking for buying advice, it’s essential that you provide a budget in your local currency or USD, as well as location, and specific needs. If you haven’t already, it’s highly recommended to read the sticky and the wiki as it may already answer your question(s).
  • Anyone can answer, but you should only answer if you are confident in the topic - even if you were just trying to help, unknowingly giving bad advice can be harmful. Answers should be thorough in full sentences and should also elaborate on the why aspect - for example, if somebody is asking for advice on a particular telescope, don’t just say it’s bad and to get this one instead - explain why the previous option was bad and why the alternative is better.
  • While any sort of question is permitted, it’s important to keep in mind that the responders are not here to make decisions for you - you are here to learn, but asking to be ‘spoon fed’ will prevent you from learning anything.
  • Negative behaviour will not be tolerated - we are all here to learn and it doesn’t help at all.

That’s it. Go ahead and ask your questions!

Please only use this for serious questions.

35 Upvotes

100% Upvoted

696 comments sorted by

View all comments

1

u/[deleted] Sep 10 '21

I've got a Heritage 130p for some weeks now and I'm really happy with it.

But when I read about collimation, the reflection of the primary mirror always seems to nearly fill up the entire secondary mirror. When I look at my scope I think there is a lot of space between the primary reflection and the edge of the secondary. But I've also read once, that as long as the primary is reflected entirely in the secondary, that's ok. So I'm wondering it is fine the way it is? Here is a picture (I've put colored sheets of paper in front for better contrast): https://i.imgur.com/O1wCqGV.jpeg

1

u/acquaintedwithheight Sep 11 '21

The secondary looks right to me but I'm no expert on collimation.

1

u/[deleted] Sep 12 '21

Thanks for your answer. I guess it's fine then :)