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wimvb

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Everything posted by wimvb

  1. wimvb
    Hope the cake tasted as good as it looked, and that all went well. congratulations to you both.
  2. wimvb
    +1. Excellent result on this group, Mikey.
  3. wimvb
    Do you need to see Polaris? Polar alignment can be done without. For (initial) drift alignment, you don't need it in view either.
  4. wimvb
    Just two questions, Gina. How good is the durability (especially uv resistance) of the plastic used? Some plastics become brittle when exposed to uv light for extended periods. The other question is about the middle section of the cover. From your image, it looks like this section can become stuck behind the fixed section? But you've probably already seen to this.
  5. wimvb

    Liverpool Telescope

    Images added to a gallery album owned by wimvb in Member's Album

    Images from the Liverpool Telescope. http://telescope.livjm.ac.uk
  6. wimvb

    ngc 6951

    wimvb posted a gallery image in Member's Album

    ngc 6951

    From the album: Liverpool Telescope

    © Wim v Berlo 2017

  7. wimvb

    ngc 4449

    wimvb posted a gallery image in Member's Album

    ngc 4449

    From the album: Liverpool Telescope

    © Wim v Berlo 2017

  8. wimvb

    Messier 88

    wimvb posted a gallery image in Member's Album

    Messier 88

    From the album: Liverpool Telescope

    Messier 88 galaxy 9 x 90 s Blue 7 x 90 s Green 19 x 90 s Red Some of the frames are 120 s exposures Processed in PixInsight

    © Wim v Berlo

  9. wimvb
    Yes, found it too: If you have a somewhat higher roof/lid, the scope can sit a bit higher as well, allowing imaging down to the horizon. But imaging to the north is more difficult.
  10. wimvb
    How about this simple setup? Came across it in the indilib forum http://www.indilib.org/forum/general/1014-post-your-indi-setup.html#7313 Sure looks simple enough
  11. wimvb
    Which is about the same size as an umbrella. I think that I would make ribs from plywood (4 semicircles), and cut the cover from alumium sheets. Just a thought.
  12. wimvb
    Looks like a '70-s umbrella. Or: Cut one in pieces, then scale it up. How large is your obsy going to be, and what material? (sorry, you answered that last one already)
  13. wimvb
    A. Yes, but you probably only see the effect if the number of subs dropped is about the same as the number kept. Removing two subs out of a stack of 30, hardly makes a difference. But removing those out of a stack of 5 will. B. Yes again, if you dial in the correct kappa value. Adding a bad pixel map in lieu of darks also helps. As will other methods, such as cosmetic correction, which looks at each pixel neighbours in each individual sub, and then replaces it if it deviates more than a certain amount (again in units of standard deviation).
  14. wimvb
    That looks great! Glad you sorted out the problem. With a coma corrector (I use a baader on my 150pds), stars will look much better too. In phd, you can check how often dec was corrected. This will give you an indication about polar alignment accuracy. Cheers,
  15. wimvb

    Messier 76 HaRVB

    wimvb posted a gallery image in Member's Album

    Messier 76 HaRVB

    From the album: Liverpool Telescope

    My take on the little Dumbbell. Data from the Liverpool telescope. Processed in PixInsight.

    © Wim v Berlo

  16. wimvb
    Frank, have you tried running the PHD guiding assistent (under the Tools menu)? It will report the status of your setup. If there is backlash or the settings are off, the assistent will suggest what to do.
  17. wimvb
    Good luck, hope you get it sorted out.
  18. wimvb
    I know the feeling. Some time ago, I had a similar experience. I couldn't get polar alignment right, no matter what I did. Finally it dawned on my that I was stepping around on the soggy grass after winter, and my telescope actually bounced up and down every time I passed too close to the north leg of the tripod. This despite it being on fence-post-anchors that are driven into the ground. Sometimes it's those small annoying things that ruin a session, untill you figure out what it is. In the end, I gave up on trying to get polar alignment perfect and just went with it. Guiding was good and the images turned out ok anyway. I'm sure that if you come back another night, everything will run smoothly.
  19. wimvb

    ngc 7479

    wimvb posted a gallery image in Member's Album

    ngc 7479

    From the album: Liverpool Telescope

    © Wim v Berlo

  20. wimvb

    ngc2207 HaRGB

    wimvb posted a gallery image in Member's Album

    ngc2207 HaRGB

    From the album: Liverpool Telescope

    © Wim v Berlo

  21. wimvb

    Messier 91

    wimvb posted a gallery image in Member's Album

    Messier 91

    From the album: Liverpool Telescope

    © Wim v Berlo

  22. wimvb

    Messier 27 HaRGB

    wimvb posted a gallery image in Member's Album

    Messier 27 HaRGB

    From the album: Liverpool Telescope

    © Wim v Berlo

  23. wimvb
    Messier 106 4 panel mosaic

    From the album: Liverpool Telescope

    © Wim v Berlo

  24. wimvb
    @mAnKiNd: Here's a pic with the focus settings of my scope/cc/camera. The line marked K20D is for just the camera. The line below is for camera with Baader CC.
  25. wimvb
    Welcome to sgl. Fyi, I use the baader cc with my 150pds, and it works great. Together with my pentax dslr, I didn't need any spacers. But the pentax has a little more 'back focus' than a canon. I wouldn't worry about guiding issues for any of the CCs, at the native fl of the scope it's quite easy to guide.
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