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About michael.h.f.wilkinson

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    Neutron Star
  • Birthday 21/01/62

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  • Interests
    Astronomy, computer science, photography, wildlife, cookery, life the universe and everything
  • Location
    Groningen, The Netherlands
  1. Great shot. I think you are right regarding Ganymede. I have picked up some detail on some moons of Jupiter with my C8 before. It is certainly doable
  2. Their passband is a lot wider than the Lunt's. They provide far less contrast AFAIK.
  3. I did consider the Daystar Ca-H Quark offering, but chose the tried and tested Lunt Ca-K filter, partly because the Daystar filter was just about to appear on the market, but also because of the many QA issues with the regular Quarks at that time. Besides, the Lunt Ca-K module requires no power, and therefore zero start-up time. Finally, I have heard that the Ca-K line produces a bit more contrast.
  4. Ca-K is not really for observing, only really for imaging. The 393nm passband is practically invisible to my somewhat older eyes. H-alpha tends to show a lot more activity as a rule, but Ca-K is easier for imaging due to the more even illumination. My Lunt Ca-K module has an 18mm clear aperture, and shows no sweet spot.
  5. Very nice result. Good detail and natural colour
  6. Still better than what I have here at the moment. Good catch under the conditions
  7. Good to see you are back in business, and some nice detail captured. I had my first shot from the back garden yesterday. That wasn't my first shot of the year, because my set-up is portable enough to set up across the road on the pavement. Imaging from the garden is however much less hassle.
  8. Lovely report. These smaller bins are just great for really wide-field objects such as the Hyades. They really put the objects in context
  9. Nice idea, and great shot as ever.
  10. Pity about the missing bits. Very good detail captured.
  11. Cheers, Swoop! I use an APM 80mm F/6 triplet with front-mounted energy-rejection filter (ERF, mine is a triple-band Beloptik type, which transmits bands around H-alpha, the Solar Continuum band, and Ca-K), a Baader 4x Tele-Centric lens, a Solar Spectrum 0.3 Å H-alpha filter, and an ASI174MM camera.
  12. So it has the ability to simultaneously wreck your back AND your bank account?
  13. That looks massive! Awesome new piece of kit
  14. Quite surprised how easily this lot stitched, but even more at how much prom activity was visible in the part inverted shots. I have begun to use 200 out of 1000 frames stacked, which gives a bit better results in terms of signal to noise, without losing sharpness, as far as I can see. Grey scale: Pseudo colour: Part inverted: Part inverted + pseudo colour: Clicking for full resolution highly recommended. I have some detail shots which will be processed and posted later
  15. Nice crisp disks.