Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

Sign in to follow this  

Recommended Posts


Does anyone know if I should upgrade my telescope? I have a Celestron Nextar 127slt and I've been using it for a few years now. I want to see more detail on Jupiter, Saturn and Mars.

Does anyone have any suggestions from Celestron?

Kind Regards

Share this post

Link to post
Share on other sites
Posted (edited)

That largely depends on your observing location(s). If you live or can get to a location with frequent good seeing, then an upgrade of the aperture might be viable.
I personally believe that for a serious planetary views the minimal telescope aperture is 150mm (6") But that's for a refractor. A reflector or a CAT (anything with the central obstruction caused by the secondary mirror) better be bumped to 8". But the really striking planetary views are possible only after 10" (like 12"). It's all about the maximal resolution the aperture provides vs the type of atmospheric turbulence it need to deal with. If you are observing from a dense urban zone exclusively, most likely you will never get decent views with such a large aperture, as in the city the turbulent air has a small-celled structure of about 5" in size on average, so the image will be blurry at high magnification in a larger than 5-6" scope 99.9% of the time.

Edited by AlexK
  • Thanks 2

Share this post

Link to post
Share on other sites

I have I Mak Cassegrain and I live in awfully bad light pollution (Bortle 7) 

Thanks for the advice 😀

  • Like 1

Share this post

Link to post
Share on other sites
Posted (edited)

The "Light pollution" is not a sentence to your planetary views yet :D The atmospheric "seeing" is. So, research your "micro-astro-climate" or ask your local astro-mates/club (I'm sure they would have answered you already if you have had your location added to your profile or/and signature on the forum). Your 127mm Mac is OK for planets (I have Meade ETX-125 myself). But if your seeing is good at least in certain time of the year, a 8" newt would show waaaay more.

Edited by AlexK
  • Thanks 1

Share this post

Link to post
Share on other sites

There is no 'should' here. If you want better performance, buying a bigger scope will do what you want.  I would suggest a Celestron C8 SE as the next step up. Unless the seeing at your location is consistently bad, the C8 will give better performance, both visually and with a planetary imaging camera.

Seeing in the UK has a large influence, and there have been nights when I took better images with my 127mm Mak than with the C8.  If the seeing is really good (usually outside the UK) it is worth using apertures of 14" or more.

If cost is an issue, note that SCTs are often available used at a large discount on the new price. 

  • Thanks 1

Share this post

Link to post
Share on other sites
13 hours ago, Cosmic Geoff said:


Celestron C8 SE

Do you mean Nextar 8SE?

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By JamieHardcastle
      Hi everyone,
      My other half bought me (us) a Celestron 130 for my birthday recently.
      I have watched tutorials and done a lot of reading about collimating and various other tips since alongside several hours peering through the telescope.
      I can achieve a very crisp image of the moon which is awesome. However, trying to get a decent focus on Mars/Jupiter Saturn is proving very frustrating. The only non-blurred image of any of them is a single white-point, non dissimilar to what I can see via the naked eye. 
      i’ve tried both the 20mm & 10mm lenses and adjusted the focus in and out all the way.
      Any advice would be gratefully received.
      thank you, in advance.
    • By MountainDog
      I have just encountered an error message which says "NO RESPONSE 16" when I power up my 130slt. Has anyone else experienced this issue?
    • By NightSky_Wanderer
      I am hoping someone here may be able to offer some help or advice. I have submitted a support ticket with Celestron but I am still waiting for a reply and would really like to get this working ready for the next clear sky!
      I recently brought a starsense but have not been able to use it because it comes up with the following errors,
      Err: Model Num
      The telescope model could not be read and initialization cannot proceed.
      Critical error!
      File: ..\source\mo
      Line: 1468
      An unexpected error occurred that may cause the HC to not opperate normally.
      When updating the controller and camera it finishes succesfully but when I check for new updates it proceeds to install the same one again and again.
      I can still control the mount and I think the camera tried to do an alignment in my room.
      I have a Celestron Nexstar 6SE.
    • By Witcherking10
      Hello all,
      I always been fascinated by astronomy and finally purchased a celestron nexstar 8se. Setup went smoothly but I'm a little stuck on the lens. I attached the star diagonal to the telescope and focused in on an object. I was able to see a part of the leaf on the plant in my house and I attached a picture of that. Moving the telescope left and right allowed me to see other things. I then took out the 25mm lens and can see through that when not attached to the telescope. I can see my sandals and feet through the lens and attached a picture of that. I then inserted the 25mm lens into the star diagonal and that's where all hope gets lost. I see white (assuming that's my wall) and yes the cover on the telescope is also off. No matter where I move the telescope. All I see is white. I tried last night in clear skies and pointed towards some clear stars using the skyportal app to align but I didnt see anything except pitch black through the lens. I also played with the focus but nothing. Am I doing something wrong, I would think the 25mm wouldnt be so zoomed in that I cant see anything? Thanks for any help you can provide me. Looking forward to exploring!!

    • By Astrofriend
      I continue my reports from observatories I have visited. This one is very special for me, I did my education in astrophysics at this place in the 1990s. My girlfriend and I took the car this weekend and visited Saltsjöbaden for a walk, only 30 km from where we live. We ended the walk up at the Stockholm's Observatory.
      Some photos from this beautiful place:
      One of the observatories at this photos is the astrograph which I already earlier had written about.
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.