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michael.h.f.wilkinson

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michael.h.f.wilkinson last won the day on May 22

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About michael.h.f.wilkinson

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    http://www.cs.rug.nl/~michael

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    Male
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    Astronomy, computer science, photography, wildlife, cookery, life the universe and everything
  • Location
    Groningen, The Netherlands

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  1. michael.h.f.wilkinson

    May 23, 2018: 31-pane, 87 Mpixel Lunar Mosaic

    MS-ICE stitches lunar mosaics fine, and can export them to 16-bit TIFF, so I can tweak curves and do other processing afterwards in ImPPG or Gimp. AutoStitch only exports JPEG.
  2. michael.h.f.wilkinson

    Best budget scope for astrophotography

    I also got some decent results with an EQ3-2 (although an HEQ5 is certainly advisable). A long telephoto lens can also work well. I got this result with my DSLR and 200 mm F/2.8 both at full aperture and stopped down to F/3.5
  3. michael.h.f.wilkinson

    M83 - The Southern Pinwheel Galaxy

    Beautiful image. That was one of the last Messiers I spotted. Very hard with 15x70 bins even from down-under where it was right overhead. The very last two Messiers I spotted were M72 and M73, from Olly's place. Both very easy with his 20" Dobson (Sir Isaac)
  4. michael.h.f.wilkinson

    Which Takahashi refractor?

    Sorry, no. Nitrogen purging prevents the scope misting up on the inside, for dew on the outside you still need dew bands. Fog or thin cloud can only be beaten to some slight extent by going to longer wavelengths (Rayleigh scattering is inversely proportional to the wavelength to the fourth power). Birding scopes have no special optics, other than being weatherproof. I have used my APM 80mm F/6 triplet (not LZOS, just a good Chinese triplet) together with an Orion 2" 90 degree Amici prism and Nagler 22T4 for birding, and the images are stunning, far beyond what I have seen in most birding scopes, except some VERY expensive ones, and even those I had beaten by a mile in terms of field of view.
  5. michael.h.f.wilkinson

    Astrolumina dielectric LRGB filter set 1.25"

    These are 1.25" mountings
  6. michael.h.f.wilkinson

    luna 23-5-2018

    Very nice indeed
  7. michael.h.f.wilkinson

    May 24, 2018: Sun in WL and Ca-K with three ARs (one brand new)

    Cheers guys. I just had the SolarMax-II 60mm out for a look in H-alpha, and was surprised to see I couldn't really spot the proms in the east. A bit odd.
  8. Got some solar data early this morning, before going to work. I noticed a new AR with a lot of faculae, some pores, and a sunspot right on the edge of the disk. Difficult to spot, but it should get easier. One AR seems to be losing steam, however. It still shows brightly in Ca-K, but is clearly shrinking in WL. On the plus side, there are quite a few faint proms visible in the part inverted Ca-K image, so fingers crossed for more activity. WL, grey scale: WL, pseudo colour: Ca-K, grey scale: Ca-K, pseudo colour: Ca-K, part inverted: Ca-K, part inverted + pseudo colour: Best seen at full-res as usual.
  9. michael.h.f.wilkinson

    Sun Ha May 23rd 2018

    Very nice collection. Love the fine detail in the prom in particular
  10. Stack of 400 images out of 2000, taken with my C8 and ASI178MM camera, using a Baader IR pass filter. Captured with FireCapture, stacked in AS!3, postprocessing in ImPPG Click for cull resolution
  11. michael.h.f.wilkinson

    Holi on the Moon

    My over the top colour processing of the Theophilus, Cyrillus, Catharina, and Mare Nectaris region. This is a mosaic of 4 images taken with the Celestron C8 and ASI224MC. The 4000-frame stacks were preprocessed in PIPP, stacked in AS!3, and the colour balance restored in RS6. I sharpened each image in ImPPG, and combined each sharpened (grey scale ) image with the RGB output of RS6 in FITSwork4. I then stitched the results in MS-ICE, and boosted the saturation in GIMP mulitple times, and did some colour noise suppression in FITSwork4 in between boosts. Finally, I recombined the highly colourful result with the sharpened and stretched ImPPG processed version of the original mosaic as an LRGB image in FITSwork. Best seen at full resolution as usual
  12. Just a quick question: Do my mammoth mosaics count as lunar close-ups (they have a resolution on the moon of about 400m per pixel), or do they have to be detail shots of a region?
  13. michael.h.f.wilkinson

    Something lurking round the corner?

    Just spotted its arrival on the disk in WL. There is a sizeable field of faculae with some pores, and larger sunspot very close to the limb. Some initial Ca-K observations suggest quite a few faint proms along the eastern limb. Will show the images later
  14. michael.h.f.wilkinson

    May 23, 2018: 31-pane, 87 Mpixel Lunar Mosaic

    Grabbed 30 1000-frame SER files, stacked 250 out of each in AS!3, ran the lot in batch mode through sharpening in ImPPG, and added in the result of the 2000 frame stack of the Appennine region posted earlier. MS-ICE stitched the results neatly, and I am very pleased with the final outcome. Be sure to inspect at full resolution! Three mosaics in four days! Not bad at all. Pitty it was cloudy on May 22, or I would have a HUGE sequence of four days running
  15. michael.h.f.wilkinson

    May 23, 2018: Tycho Dawn

    Stacked 500 out of 2000 frames to get this sunrise on Tycho, and a wide region around it. Image taken with my Celestron C8, ASI178MM and IR filter. Stacked in AS!3, postprocessing in ImPPG Should be seen at full resolution (just click)
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