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    SGL 2017 SP

michael.h.f.wilkinson

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About michael.h.f.wilkinson

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    Neutron Star
  • Birthday 21/01/62

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  • Website URL
    http://www.cs.rug.nl/~michael

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  • Gender
    Male
  • Interests
    Astronomy, computer science, photography, wildlife, cookery, life the universe and everything
  • Location
    Groningen, The Netherlands
  1. Just set up the rig I will use in the USA for the eclipse. I filled the DIY hollow counterweight with sand, and with the battery pack taped to it, I got perfect balance
  2. Thanks Alexandra
  3. Bloody sun, getting in the way of the clouds šŸ˜›. Nice shot
  4. I have a large collection, but don't take much time choosing what I will use on a target. On a galaxy hunt, I will start with the Nagler 31T5, and quickly switch to the 22T4 when I have found it. I then inspect it and judge whether the 17T4 might be better (typically on compact galaxies). For planetaries, the 31T5 is the finder once more, and I then switch to the 17T4, Delos 14 or Nagler 12T4, again, depending on surface brightness and size. In rare cases I even throw in the XW10. For planets, the Delos 14mm is up first, and then depending on conditions I work my way up the magnification ladder to see what works best. The Leica Zoom is certainly very interesting, and might replace a couple of my EPs, at some point
  5. Very nice indeed. A little bit of a NR problem. I sometimes find that the NRs in the flat do not coincide with the NRs in the image, in which case they actually make matters worse. I wonder if I could write some optimization code that could fix this
  6. lunt

    Tuning the etalon can be tricky. A prominence (not a flare, and that is quite a sizeable one) like you captured there will show over a slightly wider range than the surface detail in my experience. Focus is also critical. To me, the fact that you could tune the etalon to get a prominence suggests the tuning mechanism is not leaky.
  7. That is lovely!
  8. Nice captures. How many frames did you stack? With more aggressive processing, and a 3x Barlow, you tend to need either longer exposures per frame, and/or a lot more frames.
  9. Lucky man to be in such a dark area. There still is air-glow to contend with. Molecules in the upper atmosphere are excited by UV in particular, and release that energy at night (akin to phosphorescence). As you would expect, it decays overnight, and is minimal just as astronomical darkness ends
  10. Interesting. I do note a colour difference as well. Could light pollution have gone down as well, due to lights being switched off at night in many buildings (and some street lights as well, in some areas)?
  11. One of my submissions to the IAPY 2017 contest has been shortlisted http://www.telegraph.co.uk/science/2017/07/25/insight-astronomy-photographer-year-2017-shortlist/sun-photographed-calcium-k-light-depicting-stars-inner-chromosphere/ Chuffed to bits, of course
  12. I have just checked AirBnB for places to stay in Casper during the eclipse, and there are people asking literally thousands of USD for one night. That's the true spirit of the free market in action. For my part I will exercise my freedom to decline that offer. I will stick with the old plan of driving during the night from Estes Park to Glendo
  13. Lovely image. I think the colour rendition in the first is particularly natural looking
  14. Link works for me. Nice image. Like the capture of the galaxy as well
  15. Nice one!