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wimvb

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Everything posted by wimvb

  1. wimvb
    That's just in your sweet spot. Stick with that. Imo, it's easier to process images that are (moderately) oversampled than undersampled.
  2. wimvb
    Use the preview aggregator script (Script > utilities) and combine pv2 and pv3 into one image. Take pv1 as reference for the background and "aggregated" for white reference. Uncheck structure detection. Then apply to your image.
  3. wimvb
    Great! So, how many galaxies did you catch in your net? 😉
  4. wimvb
    👍 What gain do you use for the asi178?
  5. wimvb
    Have any of you posted this on the indilib forum? I use phd with indi and haven't had these issues. And the meridian flip works every time. The only problems I've had lately were with the mount; dec backlash and stiction. Fwiw, I have indi on a rock64 with emmc drive, zwo imaging and guide cameras (asi120mm-s) and eqmod mount. Ekos runs on the same hardware. Is the drift you experience in ra, dec, or both?
  6. wimvb
    A way to avoid sinking tripod legs and get a repeatable tripod positioning (faster PA), is to use fence post anchors or something similar. I used these (L shaped one), with the vertical plate removed. https://www.ebay.co.uk/itm/Zinc-Plated-U-Type-Post-Fence-Foot-Anchors-Packs-/262736097733?redirect=mobile They are cheap and won't be a problem if you have kids or dogs using the lawn daytime.
  7. wimvb
    That's how I started too. Yes, it just takes time. It definitely will. Study not just the processes, but also the PI methodology: an image consists of lightness zones, and also levels of detail, called wavelets or layers. The layer concept of PI has nothing to do with the layer concept of PS/GIMP.
  8. wimvb
    Image drift is either poor polar alignment or a mechanical issue. You can check PA with Ekos or PHD guide assistant. If I were you, I would run GA anyway. It seems to me that you are trying to compensate a very basic setup miss with a software fix that isn't intended for the job. What setup do you use? Scope, mount, guide scope, guide camera? Check that everything is bolted down and that there is no mechanical movement. Also check balance and cables.
  9. wimvb
    Best "finishing" software to use with Deepskystacker PixInsight. But best used "straight up", ie without DSS. Imo, you need software that can handle 32 bit.
  10. wimvb
    Excellent data to work with. Here's my result.
  11. wimvb
    As @geeklee already wrote: the image seems very over exposed, If the background level is at 50%, you lose half the dynamic range of your camera. Also, after this high background level is corrected, there are several strong gradients in your image. You will need to examine your calibration process. That being noted, here's what's in your image after gradient removal, colour calibration, stretching and colour saturation, using PixInsight:
  12. wimvb
    Yes, you need to enter your pixel size and fl for plate solving to work. After colour calibration, stretch the rgb with arcsinh stretch. This preserves and boosts colour.
  13. wimvb
    You can't image and guide simultaneously with one camera, unless you'd save the guide exposures. In this case a cmos guide camera was used for imaging. Because of the short exposures (30 s), it wasn't necessary to guide.
  14. wimvb
    When I was new at this, I tried to capture several objects in one night, getting just about 1 - 2 h of data on each. Now, I'm not even starting to look at the data before I have abt 8 hours. Processing gets a lot easier when you don't have to worry about noise. Good data takes time, and access to dark skies helps a lot.
  15. wimvb
    You're getting there. In all fairness, that other image had 15 hours of data.
  16. wimvb
    This is how I tackled the dithering problem initially. But long term, guiding is what you should look into.
  17. wimvb
    A field flattener won't do much to reduce the vignetting. You need to take flat exposures for that. A field flattener will remove field curvature. Normally the focal "plane" of a lense is curved like part of a sphere. With a large, flat sensor, you won't reach focus across the entire chip. A field flattener will even out this curvature. But you still have less light reaching the corners of your sensor than its centre. Only flat exposures will correct that. In your image, you have walking noise. If you dither, ie move the telescope in a random direction, a few pixels between exposures, this will disappear. What processing software do you use?
  18. wimvb
    A rule of thumb that I use is that if the main target looks noisy when only stf applied, but otherwise still linear, then more or longer subs are needed.
  19. wimvb
    A bit noisy. Cmos works best with LOTS of subs. Try to collect at least 100 L subs. You can collect fewer rgb and blur the rgb image before lrgb combination. My process in short: aligned the new r, g, and b masters with the first L master. The newest L has subs that were rotated too much, so I used the old L cropped L and R, G, B masters, then applied DBE to all. rgb combination RGB: background neutralization photometric color calibration arcsinh stretch desaturated the background with a range mask to protect the galaxy and stars convolution saturation enhancement L: deconvolution histogram transformation hrd compression curves transformation LRGB combination
  20. wimvb
    Ok, I'll try again. Anyway, here's the luminance so far.
  21. wimvb
    I can't get colour calibration working. The histogram also shows that your R and B masters are identical. Can you check that the stacking process produced the correct output.
  22. wimvb
    I downloaded your data, and it seems that you have some calibration and stacking errors. For one, your luminance has an inverted vignetting pattern. Are your calibration files working ok? With cmos cameras, your darks MUST match your lights in temperature and exposure time. If you use 3 different exposure times, you need 3 different darks. Scaling darks doesn't work. I'm processing your data, and will get back with the results.
  23. wimvb
    @gorann: "Follow that book with all your intent, and your journey towards the dark side will be complete."
  24. wimvb
    Maybe something for our sponsor to pick up?
  25. wimvb
    Nice! I would never have spotted that. Btw, the link in your original post seems broken. Glad påsk!
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