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michael.h.f.wilkinson

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About michael.h.f.wilkinson

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  • Birthday 21/01/62

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

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    Astronomy, computer science, photography, wildlife, cookery, life the universe and everything
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    Groningen, The Netherlands
  1. Lovely shots. The second definitely has the better colour balance. Looks like a baby red spot is visible once more
  2. Well spotted! Having Sirius at an altitude of 45 degrees is a luxury I don't have here. Your seeing must have been great for inexperienced observers to spot the pup. Having a few inches more aperture than my C8 cannot harm either. Maybe you could try more of a planetary imaging approach to catching the Pup, by making a short video (uncompressed if at all possible) and stacking this in AS!2. Might try that myself one of these days, if Sirius sticks its head over the parapet (trees behind our house)
  3. Lovely disk!
  4. Very nice collection. Great detail.
  5. BTW, I know a hammerblow to the thumb will hurt, just as you and I know I can find the Great Orion Nebula southwards of the group of stars known as Orion's Belt
  6. Not really: I don't just have past experience (which itself is prior knowledge: stored observations), I also have understanding of the neural pathways involved in pain. Knowledge is not the same as belief, which is based on some "just so story", preferably an ancient one (as in the case of astrology), rather than something that might be updated as observations are accumulated.
  7. That is not belief, that is knowledge! Very, very different beast entirely
  8. Nice disks and detail. Good to see some spots again
  9. I have one or two friends who believe in astrology and mystic harmonies of various crystals (generally cheap mine waste being passed off as something valuable). I don't believe any of that, but that is typical for an Aquarius
  10. Just two quick hand-held shots with the Canon 100-400mm L IS USM at different exposure times. The moon is overexposed in the first, but there are hints of three moons to the right of Jupiter. The clouds also give a bit of atmosphere. The second has the moon exposed correctly, but Jupiter's moons cannot be seen. Both images clearly so Jupiter as a disk, and the second one even hints at banding on my bigger monitor.
  11. Interesting report. I have observed filterless for years, and detected quite a few faint ones, very often by looking out for dark areas indicating a dust lane or blob blocking light from something behind it. SInce I got my UHC and O-III filters, I note that many of these faint emission nebulae are much easier with the filter (in particular UHC). I have a filter-switch diagonal from Denkmeier, and that allows rapid switching between filterless viewing and one of two filters in the filter slide, so the effect is easy to see. The effect certainly depends on the degree of LP. In moderate LP the effect is unmistakable, but even in very light LP the UHC helps. I was once in the Haut Provence near Olly's place, and the contrast in the North America Nebula and especially Pelican was clearly enhanced by the UHC filter, and there was hardly any LP there. For reflection nebulae the filters don't work, of course.
  12. Nice collection. Good to see some spots once more. No luck here whatsoever
  13. Aperture fever doesn't always talk nonsense
  14. The weight difference is about 25% in favour of the C5, which is certainly not to be sneezed at in a travel scope. Maks may well be a touch sharper, but you would need a sturdier tripod than your average photo tripod to notice. The the F/12 Maks are not too bad in terms of FOV compared to the F/10 SCT, but the F/15 Bresser has less than half the area of sky visible at maximum FOV of 1.25" EPs. There is a 5" F/10 Maksutov by Intes, but that is rather expensive 9superb, no doubt). If a weight of about 3.5 kg is no objection, I would prefer a C6, but that is aperture fever talking
  15. This thread is now locked