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Thread: NGC6960 - Western Veil aka Filamentary Nebula SHO WIP

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    Default NGC6960 - Western Veil aka Filamentary Nebula SHO WIP



    While my QHY16200A is visiting China for repairs I have started imaging with a QHY163M. It is taking me some time to get used to CMOS imagers and I am certainly not there yet. This was taken with Gain 174, offset 77 at -10˚C. The well depth is only a few thousand electrons with this gain so even though these exposures are narrowband and only 5 minutes, tons of star cores are blown. This is just a test integration with 12hr of data. I have one more night where I can collect data before my schedule takes me offline (w.r.t. AP) for the rest of the month. I see that if you blow the image up my stars have darker centers yielding a donut appearance. I'm sure this is happening during integration, probably some clipping artifact somewhere. The individual frames are fine and focus is decent. Obviously I will need to figure this out before I can attempt a final processing. If anyone using PixInsight has an idea what to tweak to prevent this I'd love to hear it <G>. I was working on a mosaic of the whole region before the TEC cooler in my camera died. Hopefully I will get to return to that at some point. Meanwhile, here is a small but interesting chunk of the region. The processing was crude and ham handed given that this is just a WIP test integration
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    Richard
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    Default Re: NGC6960 - Western Veil aka Filamentary Nebula SHO WIP

    Hi Richard,

    Regardless the appearance of the stellar disks, this is one of the finest CMOS images I have yet seen on these forums. It will be very interesting to see what you get when you have this camera "figured" out. I'm sure it will be one after another of stunning images.

    Cheers,
    JT
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    Default Re: NGC6960 - Western Veil aka Filamentary Nebula SHO WIP

    Richard,

    Definitely an awesome image.

    Whenever I see stars like this in my images, lack of focus is usually the culprit. The filaments also look a little on the soft side, as if the focus is a touch out of the CFZ.

    Maybe you've got a small number of subs in the set causing it(?) Have you reviewed all of them individually?

    Mike
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    Default Re: NGC6960 - Western Veil aka Filamentary Nebula SHO WIP

    Very nice framing of the subject, Richard. I don't often see this guy in SHO, and it is a refreshing change that reveals more detail than RGB. I hope you are able to get your project re-started soon!

    Bob
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    Default Re: NGC6960 - Western Veil aka Filamentary Nebula SHO WIP

    Awesome! I like the blue- indigo nebulosity.
    Marius
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    Default Re: NGC6960 - Western Veil aka Filamentary Nebula SHO WIP

    Certainly is a different take on the usual Veil. Good luck with the camera.

    Joe
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    Default Re: NGC6960 - Western Veil aka Filamentary Nebula SHO WIP

    Quote Originally Posted by chartram View Post
    Richard,

    Definitely an awesome image.

    Whenever I see stars like this in my images, lack of focus is usually the culprit. The filaments also look a little on the soft side, as if the focus is a touch out of the CFZ.

    Maybe you've got a small number of subs in the set causing it(?) Have you reviewed all of them individually?

    Mike
    Hi Mike,
    This is a refractor not a reflector so I don't think one would expect out of focus stars to be donuts since there is no central obstruction. The donuts are not present in the individual frames and each filter had at least 40 subs. I think focus is as good as it can be for the seeing as the camera is connected to the scope directly without a reducer, flattener or whatever whose back focus requirements could be not met and focus is achieved via the SGP autofocus routine so it is measuring the actual star images at the sensor. That being said, the individual images do look soft to me. Perhaps that is a perceptual issue given the lower dynamic range (full well depth ~ 1,500 IIC at gain 174, offset 77) compared to my QHY16200A. I suspect that clipping is somehow involved as most of the star cores are blown given the tiny well depth. Unfortunately I may not get to deal with this for a month or so since I need to turn my attention to upcoming travel. Also maddening download freezes with the QHY163M have forced me to spend much of my time trying to get to the bottom of that. It is no fun having to set an alarm every hour to deal with download freezes and still lose hours of the scant 6.5 hours of darkness now available. I'm working with QHY to try to find the souce of the problem. I never had these problems with my QHY23 or QHY16200A so I suspect a hardware, firmware or driver problem.
    Richard
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    Default Re: NGC6960 - Western Veil aka Filamentary Nebula SHO WIP

    Hey Rich,
    The only time I notice the doughnut stars is when a different stacking method from median is used...
    Were you playing around with the stacking parameters at all?

    Just my 2¢ adjusted for inflation...
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    Default Re: NGC6960 - Western Veil aka Filamentary Nebula SHO WIP

    Richard,

    Regardless of the donut stars (clipping issue?), the bloated, almost see-through stars throughout the frame and the softness of the filaments around the nebula points to the focus being off for one reason or another. Hope you get it sorted out... This will be another of your masterpieces in SHO!

    In the meantime, safe travels sir!

    Mike
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    Default Re: NGC6960 - Western Veil aka Filamentary Nebula SHO WIP

    Hello Richard,

    the SII in your SHO capture is making pretty much a difference, - really amazing!
    Thanks,

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