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.

sgl_imaging_challenge_celestial_motion.thumb.jpg.a9e9349c45f96ed7928eb32f1baf76ed.jpg

Recommended Posts

Hi everyone,

I recently got myself a GSO 6" f/4 astrograph, but seems like the secondary mirror was quite off. I then tried collimation using Astro Baby's tutorials, and others around the net. I've had a few Nets during the past 20 years, but this one seems to be a bit of a pain to get right. The secondary holder is a bit stiff. Anyone here done any mods for the scope and have reasonably good performance? I'be attached an image with Mire De Collimation circles. Image shows the reflection of primary, followed by the edge of secondary and followed by the grey card placed behind the secondary, which ends with the focuser tube. Any help will be appreciated.

Edit: If I were to move the secondary towards 2'o'clock position, could it solve the problem?

collimation error.jpg

Edited by astrosathya

Share this post


Link to post
Share on other sites
55 minutes ago, astrosathya said:

secondary towards 2'o'clock position

Hi. Yep, down toward the primary -maybe half a turn anticlockwise of the centre bolt- and then upwards should do it. It maybe OK as it is; do a star test in and out of focus. The tube should be short enough to adjust the primary and view at the same time.

HTH and clear skies

Share this post


Link to post
Share on other sites
24 minutes ago, alacant said:

Hi. Yep, down toward the primary -maybe half a turn anticlockwise of the centre bolt- and then upwards should do it. It maybe OK as it is; do a star test in and out of focus. The tube should be short enough to adjust the primary and view at the same time.

HTH and clear skies

Thank You. :) With a secondary mirror this large, its quite difficult to really say. I'll try it out tonight.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Asghar
      Hi all,
       
      I'm pretty new to astronomy and need help deciding if I should buy the following telescope or not, mainly if there is anything visibly missing by looking at the photos?
       
      Thanks in advance!



    • By R26 oldtimer
      I see that there are some great actions for PS out there but they come at a price. Have you come across any free and good actions, that you can recommend?
    • By dragorom7
      Hello, i am new to this forum, i made my account here because i need help.
      So few weeks ago i ordered a USB to Serial cable to be able to Control my Telescope with my computer using stellarium.
      It arrived today.
      So i made my Star Alignment, then i plugged the cable to my Telescope and Computer, i installed the Cable driver and ASCOM Platform + ASCOM Celestron Driver.
      I started DriverConnect.exe and put the Celestron Driver i downloaded, and did the properties informations ( had to tick on "Advanced Setup" and "Show All COM Ports" ) and i put "COM8" on "COM Port", then i pressed "OK" and then "Connect"
      Result:
      Create              Creating device
      Connected           Connecting to device
      Error               System.Exception: Connect to COM1 failed, no Celestron scope detected
         to System.Dynamic.ComRuntimeHelpers.CheckThrowException(Int32 hresult, ExcepInfo& excepInfo, UInt32 argErr, String message)
         to CallSite.Target(Closure , CallSite , ComObject , Boolean )
         to ASCOM.DriverConnect.ConnectForm.btnConnect_Click(Object sender, EventArgs e) in C:\ASCOM Build\Export\ASCOM.DriverConnect\ConnectForm.cs:line 268
      Dispose             Disposing of device
      ReleaseComObject    Releasing COM instance
      ReleaseComObject    Completed release. Count: 0
      GC Collect          Starting garbage collection
      GC Collect          Completed garbage collection
       
      "Connect to COM1 failed, no Celestron scope detected"

      In Stellarium i set-up everything, the plug-in and restarted the app, then added my telescope  and i says it's "connected" but i can't find my telescope.
       
      Telescope:
      Celestron NexStar 127SLT
      The Cable i bought:
      https://www.amazon.com/Telescope-CP2102-Adapter-Control-Console/dp/B077G37VL1/
      PC Specs:
      Windows 10 Pro, GTX 970, 8GB Ram(DDR4), i7 6700 3.4Ghz
       
      Looking forward for your help, thanks in advance,
      dragorom7.
    • By LILYDENISE
      Hello everyone, happy Tuesday.
      First time stargazer here, I'm hoping I can get some awesome feedback from you guys. 
      my fiancé and I are planning on taking a trip to Great Basin National Park from October 25th-30th, we're trying to catch the new moon, we want to do some deep sky viewing but we're having such a hard time on knowing which kind of telescope to purchase. we do have a few must- haves on our purchase, but I wanted to see what you guys recommend and what your experiences have been.
      we need a telescope that is portable
      good for deep sky viewing
      reflector vs. refractor
      and almost, but not necessarily, easy to use (we have time to learn the ins and outs of it)
      I apologize if its a lot, but trying to understand the jargon, as of now, is giving me a hard time
      Cant wait for any responses!!
      p.s. anyone ever been to Great Basin? what should we expect on our trip? its our first time going and first time doing any serious camping!!!
      THANKS A BUNCH!!!
      -LILY 
    • By GiovanniF
      Hi to everyone, I used to do some astrophotography in the past with a Celestron AVX and DSLR but after few month had to give up for several reasons, including light pollution (I'm living in zone 3 east London), and also working shifts. Now I want to start again, and this time more serious. I've been searching around for a couple of months to choose all the gear and I'm quite happy with the list so far although it's a bit over the price I planned at first.
       I will get an William optics Z73 with his 50mm guide scope, a flattener/reducer 0.8, light pollution filter IDAS D2 and as camera I will use a Canon 600D modded and I will buy a ZWO 183MC Pro, after so much research, I'm very happy with the scale and framing I will get with this combo, but I'm starting to get confused with the mount.
      My first idea was to go for an HEQ5 Pro, as my previous experience with the AVX has been awful, then I realized that the FLO, sells that mount with belt modification and also some cleaning and tuning if required, I heard that it's a big improvement over the stock one and the price it's ok, but another important factor for me it's portability. Unfortunately, my garden doesn't allow me to do much so I will need to carry around on trolley, for a km walk, I'm a strong person and been doing plenty of time with the AVX, so my confusion came recently when the iOptron mounts entered my radar. I start comparing the heq5 pro with belt, with the iOptron cem25EC and the CEM40 without encoders, and I'm so unsure of which to buy, the cem25 seem to be the equivalent of heq5 at least speaking of payload, but in some threads I read people saying it's a bit fragile so kind of remove it from the equation although the weight it's interesting for my situation, then the cem40, seem to be quite similar on weight to the heq5 but with higher payload and that's interesting too as I will buy a C11 at some point.
      Now it will all come down to the accuracy of tracking I guess, how the heq5 and cem40 would compare on tracking and guiding? If the cem40 it's better, I would probably go with that since it holds more and would last longer as I don't plan to get anything bigger than a C11, but if the skywatcher it's better, I could decide to go for that, and when I move to a place with better garden then get a second mount with higher payload.
      Apologise for the long post and my english.
      Kind Regards,
      Giovanni. 
×
×
  • Create New...

Important Information

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