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_banner_30_second_exp_2_winners.thumb.jpg.b5430b40547c40d344fd4493776ab99f.jpg

DaveS

First Light 130 Triplet

Recommended Posts

Well, sort of first light. After doing a 20 point model I tried 1 hour of 5 min Luminance subs of M33. Very rough process, bias only then 3 histogram stretches with gentle curves. Because of the LP I took the L subs through an Astronomik CLS-CCD filter.

Photoline test.png

I'm not sure about the focus though, as I rather rushed into taking the subs after doing the model without checking with a B-mask, in too much of a hurry to get an image. I could definitly do with taking Flats.

  • Like 7

Share this post


Link to post
Share on other sites

If the focus is out then its only a tiny little bit, great image

Share this post


Link to post
Share on other sites

Thanks Jules. Imaging at just over 1" / pixel I may have been worrying too much about focus. I'll check the next clear night.

Now to get the Ha and RGB. Yeah, right!

Share this post


Link to post
Share on other sites

 Looks very promising Dave, is that the full FOV or cropped.

I didn't venture out last night as it was raining fire from the sky :grin:

Dave

Share this post


Link to post
Share on other sites

Hi Dave, yes it's the whoke frame, 910mm is giving me a very nice fl for framing.

It was raining fire here too, which is why I was concentrating on modeling. I tried a Ha but the MLPT went haywire so I spent the rest of the night doing an Autopoint model which gave me 40 points which I'll try to add to the 20 I already have.

I think from here my next 'scope is likely to be something in the 2m+ fl range, possibly  10" GSO RC, but not until I can move somewhere dark to make imaging galaxies really worthwhile.

Share this post


Link to post
Share on other sites

Very nice image

There seems to be a bit of tilt in focal plane? Stars in bottom left part of the image are bit out of focus.

Also interesting "feature" on one of the stars - big one on the top about 1/4 way from the left - looks like two jets coming out of it?

Share this post


Link to post
Share on other sites

Looks good to me Dave, I was just saying that conditions were not good last night and my stars also appeared bloated. Perfect image scale you have there.

ChrisH

Share this post


Link to post
Share on other sites

Looks pretty good. I do agree with the focus tilt though. There may be some slack in the focuses or imaging train  

Tom. 

Share this post


Link to post
Share on other sites

Argh! Focus tilt! Not the dreaded focus tilt!

Actually, there may be some in the Trius camera, which has a tilt plate built in. I've been meaning to dowmload a trial of CCD Inspector so this might be a good oportunity.

All the componants of the imaging train are screwed together, and the focuser was locked, both the pinion and the draw tube, which is 3.7" dia.

Share this post


Link to post
Share on other sites

I've just pulled the PNG into AstroArt on the main computer with its 27" monitor (I processed and posted from my laptop) and looking in the bottom left corner I see slightly radially elongated stars that look a bit comatic.

Oh dear, another job for the next clear night. Monday looks good so far.

Share this post


Link to post
Share on other sites

Well, I had another play with the data on the main machine. After the stack (Sigma, Bias only, Hot Pixel removal) I used the Gradient Removal tool, followed by two stretches with curves and a slight unsharp mask. Not sure if there's enough data yet to justify an unsharp mask, but what the heck.

Photoline trial 2nd process.png

Definitely need to take flats, as I can see some shadows that may be dust bunnies on the filter.

Share this post


Link to post
Share on other sites

Many thanks to all for the kind comments and pointers to a minor problem that I hadn't spotted.

Debating about Monday now. I really want to get some RGB data, and I may be able to get an hour of each if I start early enough, but there's the tilt to be sorted out, plus I'm not quite orthogonal to RA and Dec.

I *think* I may put this to bed with some additional data, then sort out the orthogonality and tilt and move 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 alexbb
      At the same astro party where I shot the Pleiades and partially Iris + the surroundings, I started gathering data for M33.
      For this image I used only a SkyWatcher 150PDS through which I recorded the photons on an ASI1600MMC.
      Curiously enough, I shot ~3.5h of luminance there under Bortle 2 skies, but a simple STF in PixInisght revealed less details than in 4h of luminance (through a LP filter) shot from home under Bortle 6-7 skies.
      Nevertheless, I put all the luminance together, I shot another 40mins of each RGB + 1h45min of Ha and made an image. A bit of colour only I also borrowed from an image I made 2 years ago, but in a small ratio.
      For full resolution: https://www.astrobin.com/yqr8xe/

    • By jadcx
      I bought this second hand, but it was almost untouched, and a relative bargain to boot.  New it costs 1199 EUR from TS (approx. £1035 as of 08/03/2019 but who has any idea how this might fluctuate).
       
      Highlights:
      Apo air-spaced triplet with FPL53 Multiple focus positions thanks to removable tube segments 2.5” rack and pinion focuser, rotatable, dual speed controls, 6kg payload, with printed scale CNC tube rings and dovetail supplied Retractable dew shield  
      First impressions:
      It’s a really nice box.  Whilst it’s described as a ‘transport case’ the supplied storage box is sturdy and well made.  Inside, the foam fit is precise bordering on tight.  It’s actually mildly difficult to get the scope out of the box.  Things get a little easier if you loosen the tube rights slightly, allowing for some tube rotation, and a longer term fix will be some straps to aid lifting the scope out vertically.
      The scope itself feels very well made, and is what I’m choosing to refer to as ‘reassuringly weighty’.  At just over 4kg (without diagonal, eyepiece, or finder) there are definitely lighter options available, but it’s hardly a heavyweight.  The finish is powered coat white, which looks and feels very nice.
      The focuser is very smooth (compared to my SW ED80) and feels pleasingly solid.  I’m not going to be testing the stated 6kg payload any time soon, but I can easily believe it will be able to handle it.
      The dew shield is held in  position with a single thumbscrew, and whilst it’s retractable credentials are clearly warranted, it only seems to extend a couple of centimetres.  As it happens, this takes the overall length down to 450mm which was the very top end of my acceptable range in order to meet my ‘travel’ requirement.  The focuser body also incorporates a finder shoe, but if you wanna  finder then you have to supply your own as there’s nothing included.
      The idea of having additional tube segments is that you don’t have to rack out the focuser so far, and so improves stability.  This also allows for multiple reducer/flattener options for imaging use.  The TS website details the specific configurations using their recommended equipment which provide a faster f/4.9 option for sensors up to 36mm, or a full frame flat image at the standard f/6.6.  I might be exploring these options later, but for now, this is going to be for visual use.
       
      First light:
      OK - this barely counts, but I was impatient.  Predictably enough, first evening with a new telescope and it’s raining.  But I did manage a pretty decent look at my neighbours TV aerial and chimney stack.  They need some re-pointing.

      The following evening (9th March 2019) was less rainy, but much the same for cloud, all but for about 30 minutes of relatively clear sky, interrupted regularly by patchy cloud.  So still not great.  However, my ambitious setup to allow for cooling paid off and I did manage a few minutes of actual use with a SW 28mm eyepiece.  The Baader Zoom I also treated myself to for my travel use is frustratingly still not dispatched.  And when I say set-up, I mean just carrying everything outside.  I’m using this on the SW AZ-Gti mount, and a Manfrotto tripod I had already, so it’s very easy to pick up and take outside.
      I was using the scope with one of the two removable sections in place (this is how it is stored in the supplied case) and was able to achieve focus with a 2" diagonal without having to rack out excessively.
      Sirius was an obvious target to the south, and an easy hit.  Brilliantly bright, as expected, and a blue-ish white colour.   The upper half (the rest was below my sightline from home) of Canis Major was easy to see, with several of the background stars also visible.  Despite the less than great seeing, the view was impressive.  Stars were tight and there was no obvious chromatic aberration.   Moving up to Betelgeuse, it’s orange-red brilliance was very pleasing, and again I was able to make out some of the fainter surrounding stars.
      Overall the view was very impressive, and bright.  My only real comparison is with my SW80, and of course I now have over 25% more light, so that’s to be expected.  But still, it makes an obvious difference.  I wasn’t able to note any CA or distortion, and a quick full visible spectrum (no filters) star test reflected spot on collimation and no apparent astigmatism.
      Alas, the break in the patchy clouds did not last long, and I was soon packing up for the night and heading out for a beer.  I’m looking forward to getting some more quality time with this kit, and who knows, I might even align the AZ-Gti next time and write a brief review for that too.


    • By Olli
      So a few days ago  I had my first light with my 130p and had a successful time with it I managed to view the Orion Nebula and also M45. The weather wasn’t great then but  I still managed to get great views of both these objects. However tonight shall we say, was my first test on using the scope properly. Around sunset there were no clouds in sight and if there where any they were heading west but only a few and it stayed very clear from sunset till it got dark.During the sunset I looked out my window and the view was quite amazing I do like my sunsets but I saw something and  I’m not 100% sure on exactly what it was. The object was extremely bright and on its own with nothing around it  ( it wasn’t the sun )and was facing west and I had a look  through my binoculars  and I thought it was  Venus  but I’m not a 100% sure. I’m hoping that one of you can confirm what I saw during the sunset. If it was Venus or even mercury then it was my first time seeing either of them. Or I might be  completely wrong 
      As the weather forecast once again wasn’t  acurate ( using BBC ) for the night I decided to risk it and leave my scope out half an hour before I went out they said there was supposed to be rain and some patches of cloud from about 7pm onwards. However i was quite please to see that there were no clouds in sight, whew. My main goal of the night was to see my first Galaxy. I’d thought I had seen Andromeda through my binoculars before but I was not sure that I saw it. I still need to get the hang of star hoping I still find it abit difficult but I guess the more I use the scope I’ll get used to it.  Anyway I started with Orion as that’s my main starting point and thought I’d check out M42 again as the conditions were abit better then last time.  I was pleasantly surprised that I could see more detail. I could even see the  trapezium of stars within the nebula with the 10mm eyepiece as some of you suggested in my previous report that I should be able to see it. Then my next target was m45 again the view was really nice could see all the stars clearly.
      Now as stated before my main goal of the night was to find my first Galaxy. After looking at M45  I knew that the Andromeda  and Triangulum Galaxy were close. I was using stellarium on my tablet ( with night vision mode) and also the sky and telescope pocket atlas which I bought from @JemC  both worked quite well together as I still struggle with  the atlas. I followed the Perseus constellation to find the Triangulum constellation which I think I managed to find. Near those constellations I saw to big yellow dots. Both of them were about arms length of each other. Looking at  them with  the naked eye they looked liked bright yellow stars with one slightly dimmer than the other. Now I’m again not sure if these were Andromeda and Triangulum Galaxy And I may be completely off and after looking at stellarium I noticed there are few galaxies around that area.First I aligned the finder scope  so the “ yellow star on the left ” was in the field of view I then put in the 25mm eyepeice And could see a grey smudge which at first I thought it was a patch of cloud but then after double checking I realised it wasn’t. I am stil not sure which Galaxy I saw but it was absolutely incredible. I must confess I did get goosebumps. After carefully trying to get it in focus I could see a bright yellow light which was glowing straight through it kind of like a spike of light. And the out side was a grey smudge. However  after spending about half an hour looking through  the 10mm eyepice I could start to see some black inner circles which I was thinking might be the dust lanes? And also I could see a part that was slightly deformed. It looked like a small circle looked different from the rest and I thought that might be m32 but may be wrong.
      Finaly  I wanted to see the  Triangulum Galaxy. This was slight smaller then the one I had just looked at but looked similar. I could see a grey smudge with a bright core and a disc type shape. Like the Galaxy i described before. Again the center of the galaxy had a bright yellow light. And I could also see The same type of black inner circle  after spending about half an hour or so observing.Even if  it was smaller then the other one I was very impressed in what I saw and both of  them  gave me goosebumps. I’m certain these were galaxies I double checked by looking at the stars around it to make sure that they looked different and they did. I really hope that you can confirm in what I saw and also confirm on what I described in the beginning  if it was Venus or not.
      Thanks very much for reading  sorry for the extremely long report but wanted to share what i had seen today
      Thanks for reading and clear skies  
       
    • By Hayduke27
      I had a really nice evening of observing last night, found a lot of objects new to me and enjoyed some of my other favorites.  I managed to find the Triangulum Galaxy (NGC 0777), which is one of the dimmest objects I have managed to spot to date.  I observed it and the surrounding stars for about 15-20 minutes before I began sketching.  I took my time and probably sketched for about 30-45 minutes.  I started by marking the center of my drawing area with a small spot which would become the galaxy, and then made marks where all of the visible stars were.  I then went around and filled in the stars from brightest to dimmest.  Finally I used a soft pencil, a smudge stick, and my eraser to make the galaxy.  This is my first attempt at a galaxy, and I'm pretty happy with it overall.
      Viewing was done on a very clear, cold night with excellent viewing conditions. C8SE scope, Scientific Exploration 18mm 82* EP, no filters.  I hope you like it!
       

    • By gnomus
      Back in October 2016, I did a short-ish M33 - 1 hour each of RGB, 2 hours of Lum and a paltry 80 mins of Ha.  The thread can be read here: https://stargazerslounge.com/topic/278949-m33-with-super-luminance/?tab=comments#comment-3054617
      Whilst I was on holdiay, a new version of PI was released.  This contained a new process called PhotometricColorCalibration.  The idea, as best as I can understand it, is: plate solve your image; compare it with a colour image from a 'reference' catalogue; and adjust the colour calibration to try to match that reference.  The reference catalogue used is  the AAVSO Photometric All-Sky Survey or APASS.  There has been some debate on the PI forum about whether or not it might be better to use a different catalogue.  However, I only skim read this - I can only get a few posts into a typical PI forum thread without wanting to poke sharpened matchsticks into my tender areas.  Anyhow, I thought I'd look for an RGB image to try out this new process, and M33 came up.  
      I was also alerted, by the one and only Barry Wilson, to another process called 'LocalNormalization' .  I don't know if this is a brand new process in the latest release, or if it has been around for a while but I hadn't noticed it before.  Barry gave me a brief run down on how to use it.  You choose your best sub as a reference and then run the process on all of your other subs, just prior to ImageIntegration (ie after Star Alignment) - or at least that is what I did.  LocalNorm files are produced and you add these to the ImageIntegration files (a bit like you add the Drizzle files).  Barry suggested that this process might reduce the demands on (or even the need for) DBE - and certainly the stacks did seem reasonably 'flat'.  
      I should warn that I have only a vague idea of what I am doing with these processes, and it may well be that I am using them incorrectly.  Please consult with a PI Expert (or 'Sensei', as I believe they prefer to be called) before trying these things for yourselves. 
      The new version does seem less 'muddy' to my eyes.  I have a vague recollection of seeing some M33 images with nice 'ruddy' cores, and in the earlier version I was probabaly chasing that.  I am still trying to aim for subtle ....... largely in an attempt to compensate for my personality, which is anything but.  
      This is my Esprit 120; QSI 690 on the Mesu 200: 6 x 600s each of RGB, 24 x 300s of Lum and 4 x 1200s of Ha.  If I was doing this again I would probabaly try to double-down (at the very least) on everything:
       
×
×
  • Create New...

Important Information

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