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.

Recommended Posts

Heyyy its me again! Today me and my friend went out to observe! We spotted the moon and focused on it,took some okay pictures with my phone without an adapter( that means having to hold up my phone over the eyepiece 's tiny  hole). Then we tried moving towards mars, relatively close to the moon. It wanst a dot but like a small circle with some colour, afterwards we moved towards stars,but instead of seeing these circles with the secondary s reflection in the middle, we saw small circles (like mars but smaller) they were green blue and red coloured i didn't think much of it but then i checked the mirror. And i saw some dust.... Pics bellow.Is it the mirror or is this normal? Also if its the mirror, how do i clean it without removing it, i have a celestron firstscope btw. 

Thanks.

IMG_20190113_202334.jpg

IMG_20190113_190302.jpg

IMG_20190113_190009.jpg

Share this post


Link to post
Share on other sites

From what I can see thats a perfectly normal amount of dust - just leave it, it wont affect your viewing and you could damage your mirrors finish trying to clean it.

Some telescopes have giant holes in the middle, and it doesnt affect the viewing so a few specks of dust will be fine ;)

 

  • Like 1

Share this post


Link to post
Share on other sites

Thanks but can you explain what i saw? I sawSmall circles (blue green red colour) where stars are supposed to be. 

Share this post


Link to post
Share on other sites

Small circles with a dark centre are usually what an out of focus star looks like through a scope that has a secondary obstruction, like the newtonian does.

 

 

 

  • Like 1

Share this post


Link to post
Share on other sites

I think the coloured dots are a photographic artifact,  I don't  expect a phone would be sensitive enough to show stars that close to the Moon. Ignore the dust on the mirror for the reasons already mentioned.      ?

  • Like 1

Share this post


Link to post
Share on other sites

I m not talking about those.i m talking very small spread out ones (bigger than the ones shown in the picture with 3 small circles of red green  Blue  with a black circle where stars are supposed to be.

Share this post


Link to post
Share on other sites

Your scope looks normal but what you describe is not normal

What happens to the circles when you move the focuser in and out ?

Share this post


Link to post
Share on other sites

As dweller25 has implied, did you refocus the scope  after moving from the moon to Mars ? I'm assuming the circles that you mention are when you look through the eye piece and not on your camera/image.

Share this post


Link to post
Share on other sites

Kronos831, I'd get your scope out again, point it at a star and use the focusing knob/wheel to bring the star to a pin point of light.

I think because you focused on the moon you may of thought you didn't need to refocusing again for stars.

Always check the focus when moving from target to target and especially when changing eye piece.

Let us know how you get on.

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 Gryffster
      Hi - I'm a relative newcomer to telescopes with goto - still trying to figure them out.
      I have a problem with Goto on the 8SE.
      Alignment usually works (Not always, but usually)

      I believe my set up is correct - time and date, DST and UTC (It's currently BST in the UK)

      I usually use 2-star alignment (Currently, most convenient for me are Sirius and Procyon)
      Alignment usually succeeds, but goto just doesn't. The scope slews away, sometimes even to a completely different part of the sky from the selected object (I'm familiar enough with
      the sky to be able to identify several bright stars without assistance)
      Bizarrely, this happens even if the goto object is one of the alignment stars - how could it possibly not be able to find a star when you've explicitly told it where it is?
      I've read that goto sometimes doesn't work well on battery power, so I've aquired a mains adapter. No change.
      I haven't yet updated the handset firmware (I'm waiting for a serial-usb adapter.)
      Any help would be appreciated.
      Thanks
    • By The-MathMog
      Because of the current situation, I have, as many of you guys probably have too, spend a lot more time under the stars when possible.

      It has literally been over a year since last I was out doing some astrophotography because of work.

      So here is my second take after the long break, NGC 3344 (The Sliced Onion Galaxy).
      Initially I thought it would be a lot fainter than it was, so it was basically a shot in the dark, of just trying to get back at doing this.
      But the final image actually showed a lot more detail than I would've hoped for!
      Spring lent a lot of clear night, but those seems to be gone already. I would've hoped for a few more hours to add some more luminance data to it, as I did have to push it quite a bit.
      I am not too happy with the shape of the stars either. Guiding was not very stable through the night, even though balance and polar alignment seemed to be good. Might need to update my Celestron PEC data? 

      Any advice or feedback is very welcome! 🤩
      NGC 3344 (Sliced Onion Galaxy)
      _______________________
      Image:
      Luminance - 13x16 min
      RGB - 2x16 min each
      Flat and Dark calibrated
      Gain 111
      Offset 40
      Total Integration - 5 Hours 4 minutes  (LRGB)
      _____________________
      Gear Used:
      Skywatcher 150PDS
      Celestron AVX Mount
      ZWO ASI 183MM-Pro
      Baader 2'' Neodymium Filter
      Baader 1,25'' RGB Filters
      ZWO Mini EFW
      Explore Scientific Coma Corrector
      ToupTek Camera G-1200-KMB Mono Guider
      Orion Mini 50mm Guidescope
      ______________________
      Software:
      Sharpcap
      PHD 2
      Photoshop CS2
      Deep Sky Stacker
      Stellarium/Stellarium Scope
      Astrotortilla

    • By JonCarleton
      It figures!  First clear night in ages and the pollen is as thick as..well, something really thick.  Up to now, I have been fairly careful to avoid dust getting down the tube, but pollen is going to be unavoidable for the next several weeks.
      So...what does one do?  Are there some do and don't things I should be aware of?  It looks like my mirror comes out fairly easy (SkyWatcher 10" ).  I'm guessing  "chuck into the dish washer on the pot scrubber setting" is probably a really bad idea.
      What then, is the plan?  What chemicals/detergents should be used...or maybe all chemicals should be avoided?  Is it a no-touch surface?  Is there perhaps some magic spray that one uses?  I do have a can of electronics air that I plan to use from a safe distance to persuade away loose pollen, and that may be enough for the present.
       
    • By Geordie mc
      Hi. Just starting to use autofocus with the Celestron motor focus and SGP. Can anyone give me some starting points for step size, backlash etc. I’m getting there but wasting a lot of imaging time just trying to get this to work accurately. I’m currently trying a step size of 75 and a backlash of 50. Any tips most appreciated.
    • By Tugboat
      I'm having a bit of a clearout to make way for a new project.  For sale here are a couple of items that have seen very litle use:
      1) Celestron Omni CG-4 GEM Mount + Tripod - £125 *** SOLD ***
      This is in generally very good condition.  There are a few marks, and scuffs consistent with normal use.  There are also a couple of minor (small) patches of surface rust on a few of the bolts and steel legs.  It has seen very litle use, and has been in storage for the past few years so it is time to find it a good home.  The small rubber tips that go on the very end of the feet have perished, so these won't be included.
      It includes tubular steel tripod, 2 counterweights, built in polar scope, built in bubble level and slow motion controls.
      Due to size and weight, collection would be preferred from the RG27 area.  If you are reasonably local, I would also consider delivering.
      Price: £125, but I am open to offers.  Payment can be made via Bank Transfer (preferred), Paypal or cash on collection
      2) ***SOLD*** Celestron Omni XLT 127mm Telescope ***SOLD ***
      Again this is in very good condition, and has been in storage for the past few years and has had very little overall use.  A few marks on the dovetail as is to be expected.
      It includes a small finderscope, diagonal and a 25mm eyepiece
      Can be collected from the RG27 area, I could deliver if you are reasonably local, or can be posted for an additional £8.
      Price: £110, but am open to offers.  Payment can be made via Bank Transfer (preferred), Paypal or cash on collection *** NOW SOLD ***
      Any questions please do let me know.










×
×
  • Create New...

Important Information

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