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Posts posted by oymd

  1. 5 minutes ago, vlaiv said:

    Many people now start to process starless version of their images (look up StarNet++ - software for removing stars from the image) and then put back in stars later on.

    In fact - I was going to suggest that as a way of processing nebula images with these UHC/Narrowband filters  that alter color heavily.

    If you look at above example posted by @drjolo far right color checker has only two colors that are almost as they should be - red and teal which are colors of Ha and OIII (or close enough). This means that these filters don't need color correction when shooting nebulosity.

    They do change star color very much, but you can take some exposures without filter and then use StarNet++ to create starless version of image taken with filter and stars only version of image taken without filter and combine the two. That would give you proper color in both nebulosity and for stars.

    I see...that's interesting...

    There's nothing straightforward in this hobby..



  2. 2 hours ago, souls33k3r said:

    I live in London myself (Zone 4 - East) and L-eXtreme will give you a 7nm bandpass in Ha and OIII which will be far effective than trying to use the 294 as an OSC from Zone 3. Galaxies are RGB targets with a hint of Ha for which you will most definitely need some kind of a LP filter (I'm not too clued up on that side of things) but my answer was. Specifically aimed towards you wanting to use Ha filter with this camera. 

    With regards to the L-eXtreme, I had a look on Astrobin...

    I saw this:

    Heart Nebula with L-eXtreme filter

    This cant be right? The stars have almost disappeared from the image? I know that's a characteristic of the filter, but isn't that just too much? Sure, the nebulosity seems to be enhanced, but where are the stars!!?

  3. 20 minutes ago, vlaiv said:

    V4 is UHC type filter

    L-Extreme is sort of two band narrowband filter

    Both are good choices for emission type nebulae but not for broadband targets like galaxies or reflection type nebulae.

    Btw, IDAS also has these duo band filters:


    For those - best filter is general type LPS - light pollution suppression filter.


    or IDAS variant:


    You won't be needing filters for planets - they are generally not affected by LP

    Thanks Vlaiv

    So, for emission nebulae should consider IDAS NB2 or L-eXtreme

    For the rest, a general LPS like the L-Pro or LPS P3?

    Just to avoid getting myself confused, are the general LPS filters similar to the UV-IR filters like the Baader ones?

  4. 2 minutes ago, souls33k3r said:

    I'm truly sorry to hear the troubles you've been through but it's good to have you back and feeling better. 

    Optolong L-eXtreme filter is a much better bet which works on Ha and OIII at a generous bandpass. 

    Thank you for your kind words...

    Yes, I'm eager to get back. Carrying the AZEQ6 and setting up was out of the question when I was recovering...

    As for the filter, can you please expand? DO you mean the L Extreme is a better option for Emission nebula than the LPS V4 that I already have?

    With regards to galaxies and reflection nebulae etc.. what do you advise? Like I mentioned above, I have really bad LP in London

  5. Hello everyone

    After jumping head in last May into this wonderful new hobby to me, I suffered a bicycle accident, fractured ribs, followed by COVID, so had to drop the whole hobby for almost a year!

    I'd like to get back, but I think I forgot everything I've learnt last year!


    So, as the title says, which filters have you used with said camera, with good results?

    I currently have the ZWO 2" filter drawer, and only have the IDAS LPS-V4. I gather it is good for Emission nebula? What about refelection Nebula and planets?

    Can you please provide suggestions for a good LP filter for Galaxies?

    Any other filters you suggest would be great as well?

    I live in Central-ish London, Zone 3, so LP is bad.

    Have you tried Ha filters on this OSC at all?

    My setup: SW ED80 + 0.85FR, ASI294MC Pro, 2" filter drawer

    Many thanks

  6. Just completed processing the second set of images of the heart nebula. Still following Light Vortex's tutorial on mosaic, on how to combine the image from the first set.

    This is how the second set looks like:

    23 subs @ 240 seconds.

    Unfortunately 17 more subs were discarded, as there were some tree branches in the way!! :(

    WBPP and processed in PI.

    Please let me know what you think...

    Still taking very early steps in processing...and imaging for that mater!



    Processed second part.png

    • Like 2
  7. 2 hours ago, spillage said:

    I would crop  the inner part and work on that. www.lightvortexastronomy.com is a great site for help with PI.

    If you are having eqmod issues it might be worth listing your kit as it would help diagnose any issues.

    Thank you for the tip. I have actually seen on that website a guide on how to do a mosaic. I am following it now just as a fun project. Will be interesting to see how it comes out. 

    With regards to my equipment:

    Mount: SW AZ-EQ6 Pro. I bought this in January. It’s the newer version with the USB on the mount head. 

    Scope: SW ED80 + FR 0.85 & Celestron C11 XLT. 

    Software used: APT for image acquisition and DSS or PI for the rest. 

    Currently my setup is as follows:

    I have 2 windows laptops connected via team viewer. One is connected to the camera and lives in the garden on a bench. 

    I control the laptop from inside the house. Initial setup is as usual: 

    Ipolar for precise PA, then 3 star alignment using the mounts handset. Usually my 3 stars are Arcturus, Vega and Capella, in that order. Arcturus is almost always very slightly off centre, as it’s the first star. Once I centre it, Vega and Capella are dead Center. Every time. 

    Leave the scope printed on Capella, focus using bhatinov mask, try Bhatinov grabber in APT, and usually give up as it’s never stable. 

    Then pick a target on the handset, check live view on APT. If it’s a galaxy, it’s easy framing. 

    With nebulae, it’s a struggle. 

    Start the imaging, and go inside and monitor using the other laptop. 

    Now if the garden laptop can connect to the mount as well, that would be great, but do not know really how to set that up?

    When I bought the mount in January, I experimented with EQMOD and Stellarium and CDC. Sorted the COM port, baud rate etc. 

    CdC worked ok with the mount, but Stellarium was very very temperamental. 

  8. 5 minutes ago, spillage said:

    I prefer stellarium for choosing target but always use cdc to connect to the scope as I just like the way it works. I do find that once your platesolving you really do not need to use cdc or stellarium to move the mount to you target as it is all done via the software (APT, NINA, SGPro). I am sure with APT you can also load up a previous image and use this to platesolve back to the same position.

    With APT you can download extra targets to add to the standard list available. (I have them somewhere if wanted).

    Hope some of the above is useful and not just me rambling on..

    extremely useful!! thanks

    Yes, please. I am only 3 months into the hbby, so not familiar with all the software out there.

    I have been using APT, DSS & PI so far.

    I have looked at Stellarium a few times, but never used it during a session.

    The less new software I use, for now, the better.

    I am growing more familiar with APT, so if you could help me with those files, it would be very helpful!!


    P.S. what do you think of my last post above? Is this workable? Or need to restack with new settings?

    Many thanks



  9. Hi all

    This is what the image looks like now, this is just after applying DBE division + subtraction.

    Is this workable at all, or should I just avoid stacking both of the LIGHT sub sets together?

    Yesterday night, 20 subs @ 240 seconds into the imaging session, I did the very quick processing in the top image above, and saw that I am missing the lower part of the Nebula.


    So stopped imaging, and slewed the mount a very tiny bit upwards and to the left, and then continued another 35 subs, hoping to capture the nebula completely.

    Is the problem in the algorithms I used in WBPP?

    Or this final image to be expected if there has been re-orientation mid session, and can be fixed with some clever processing?

    Many thanks



  10. 7 hours ago, ngc1535 said:

    It might be because with WBPP it is now using Average Sigma Clip for a frame number of 10... did you set the sigma thresholds for this? The defaults will not reject much if anything... which is why your things are likely showing up. 

    If you want to experiment, lower the Sigma Low to 3 (or maybe even 2.5) from a default of 4 and see what happens. 

    (most people do not use Average Sigma Clipping... )

    I will  send a note to Roberto... perhaps should have used regular Sigma Clipping in my opinion.



    thanks, will try that

  11. 5 minutes ago, spillage said:

    That is a great image and worthy of being satisfied about. I am sure that everyone here is too critical of their own work. It keeps the guys at flo busy....

    I use N.I.N.A and think its a great bit of kit. Similar to SGPro but with a better support group who seem very keen to move things along an listen to the users. I have not used sgpro for a good 6 months now.

    Not sure how many images have been stacked or what software was used but DSS should remove you trails with the right settings.


    Thanks for your comments! Very encouraging!

    Well, I quickly processed the above image as I was not able to see from the individual FIT files coming out of APT if I was on the nebula at all. 

    So waited for the first 10 subs to come in, then did a very quick stack in DSS with just 20 Ds, 20 FDs & 20 Fs, and opened the file in PI just to see if I was on the right track. 

    I know, that’s a very long and tedious process just to be sure I am imaging the right area of the target!

    its so so much easier with galaxies, as they show up clearly on individual FIT files, or even on LiveView in APT. 

    The scope is imaging away in the garden now. Hope I can get some more good data, now that I repositioned a tiny bit to the left and upwards. 

    The reason I stayed away from connecting to the mount when I got started is EQMOD, and also Stellarium refusing to connect to the mount, even when I used Stellarium scope. It would connect one day, then for a few more tries nothing!

  12. Hello everyone

    Following on from the good advice I received from members regarding framing on Nebulae, I looked for a star in the center of the Nebulae, and slewed to it, I think it was SAO 33926, not sure now, and took a set of images.

    I was super pleased and excited to be able to get most of the Nebula! Seems silly to be so excited about taking a picture that is already not so good, with all the amazing quality pics I see every day by experienced members....but it just feels so satisfying!!


    This is just a quick process of the frames that I have so far, 10 subs @240 seconds. This is still a work in progress...

    I have just re positioned the scope a little, and hopefully I will have also the brighter lower part of the Nebula. It will be light in about 3 hours, so hope I can get some good data...

    NINA, or SGP with EQMOD and plate solving is my next project, to avoid this hassle!!


    P.S. Will PixInsight accept and combine my images, even though i just VERY SLIGHTLY re positioned the scope? Can I integrate all the light frames together?

    Many thanks!


    Heart Nebula WIP.png

    • Like 5
  13. Hello everyone

    I have noticed that when ever I use WBPP I constantly get artifacts in the MASTER LIGHT?

    I have attached an example of 2 master lights, side by side. All subs and settings were the same.

    This are the master lights of part of IC 1805, 10 light subs, 240 seconds, darks, flat darks and flats.

    I ran both WBPP and BPP on the same exact subs, and in WBPP everything was on AUTO. I picked NEBULA in integration, to focus more on SNR. Same settings in all the rest.

    This artifact is CONSTANT anytime I use WBPP. It does not show up in BPP? Its covering the whole image.

    On the left is BPP, on the right WBPP? 


    BPP vs WBPP.jpg

  14. Good morning everyone

    I started last week to have a go at imaging nebula, and it was challenging. I seem to have 2 primary problems, and would appreciate some advice?

    1- Framing and orienting is near impossible as opposed to imaging galaxies, as the single sub, even when fully stretched in APT or PI shows nothing, so I can never confirm if I am imaging the right part of the nebula. Live view on APT shows black sky, even when stretched.

    I have been advised that this can only be sorted by plate solving and connecting my mount to the PC. I am working on that. 

    2- The field of view. So even if I fix problem 1, having looked at  my results so far, and also at astronomy tools, there is no way I will fit the nebulae in my FOV? Do I then image over multiple nights different segments of the nebulae and then do a MOSAIC in PixInsight? Is there any way I can widen the FOV of my setup? A different reducer flattener?

    I have attached what I imaged so far, and I have a narrow FOV.

    First is CED 214, NGC 7822: 2 sessions over 2 nights, and I barely imaged 2 small areas of the nebula

    Second is the Heart Nebula. Again, I imaged only a small part of the nebula.

    My setup:

    SW ED80mm + SW 0.85x reducer

    ASI294MC Pro OSC

    Many thanks


    Heart Nebula processed oriented.png

  15. 1 hour ago, cuivenion said:

    When I was trying to frame the heart and soul nebula I autostretched a frame in PI to check the position.

    Here's what I meant. This is the SECOND image. I triple stretched using HTT of the first sub. As you can see, there is nothing there but grey background and stars...

    Even with CurvesTransformation




    • Like 1
  16. 56 minutes ago, cuivenion said:

    When I was trying to frame the heart and soul nebula I autostretched a frame in PI to check the position.

    I did that.

    After getting first sub in APT, I opened the sub in PI, and stretched as much as i could, but got nothing.

    Guess signal was too weak from just one sub.

    I think in the future I will need to slew to a star in the middle of the field, and take it from there

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