• 36 Posts
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Cake day: January 10th, 2024

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  • bistdunarrischtoAstrophotographyM42 (Orion Nebula)
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    3 months ago

    The stripes are called walking noise/ pattern and often show up when not using a tracking mount and not using dithering.

    Because not every pixel of your camera captures signal exactly equally bright you‘ll see this difference along the movement of the sky as it gets accumulated with every subframe. The only way to get rid of it is to vary the pixels for each part of the image after each exposure. This can be done by moving the camera slightly after each shot. This process is called dithering.

    With good calibration frames the pattern can by minimized very slightly. Other than that the only real option for processing I can think of is to hide the pattern by not stretching the dark ares too much.

    Other than that great image!






















  • bistdunarrischOPtoAstrophotographyC/2023 A3 & M5
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    6 months ago

    Ah ok, so I assumed you registered all your light frames onto your stars as your stars look very sharp. And that’s the normal way for every astro image you would normally do. A comet however moves so fast that its position changes even in the short time frame were you took the images.

    So after registering all the images with the stars pattern you want to make a second registration were you mark the position of the comet on the first frame and on the last frame. With that now all images are aligned onto the comet and now the stars appear to move in the background. As your stars look so sharp I assumed you didn’t make the second registration. In DSS there is a comet mode for that but I haven’t worked with that so I can’t tell you about the workflow with that program.

    Hope that helped in any way!


  • bistdunarrischOPtoAstrophotographyC/2023 A3 & M5
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    6 months ago

    I do not have much experience with DSS, as far as I know the result should be very similar. „Lights“ is the term for a single exposure. The technique is basically the same no matter which software you use.

    But if you have Siril specific questions feel free to drop any questions :)


  • bistdunarrischOPtoAstrophotographyC/2023 A3 & M5
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    7 months ago

    It‘s hard to tell from your image, bit it appears you can even get a bit more details if you register your lights onto the comet itself and then stack all the images. I used Siril for the two step registration process.

    But nice image nonetheless!





  • bistdunarrischOPtoAstrophotographyC/2023 A3 & M5
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    7 months ago

    Thanks for answering! Yes the comet moved quite a bit, but I stacked two images. One for the stars and one for the comet were I registered the images onto the comet itself. So the stream seems to be a real feature of the comet.