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About Ruud

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    Thank you for visiting my profile. Besides astronomy, I take an interest in photography, skepticism, science, maths, podcasts, radio and cycling. I teach mathematics.
  • Location
    the Netherlands
  1. It's a pity about the uncharted territory, but most of the disk is there and it's awesome!
  2. Unusual. It's like the bow of a black Viking ship emerging from the fog. Never saw it like that. A wonderful image.
  3. For dragging the scope around the lighter weight is better (helps your back), to keep the angular momentum down the heavier weight closer to the axis of rotation is better (helps stability).
  4. I suppose this small case replaces end caps and everything. They look like nice terrestrial binoculars. Congratulations!
  5. Achim it's beautiful. Great job!
  6. Oh, this is terrible. I am so sorry this happened.
  7. A beautiful Uranus with sub-arcsecond detail. Amazing!
  8. Hey Avani, great that you're posting again. Wow, this is an amazing image from a telescope that went though a collision. It looks 100% OK, here as well as on astrobin. Most excellent! Were you in the car when the accident happened? I hope you didn't get hurt yourself. At least one thing is clear: not just the C9.25 but you too continue to produce fine images.
  9. There's already an improvement. On the Unistellar website the claim that the eVscope is " a 100 times better than a classical telescope" has disappeared. That's good. The statement is simply not true. The citizen science argument is still there. I cannot imagine how eVscope owners around the world will help scientists in any useful manner. I suppose time will tell. For the rest I think the eVscope would be a wonderful Rent-a-Scope. I'd pay €100 for a week with the thing if I' knew I'd have a week of clear, Moonless nights. Come to think of it, I'd sell my sister for a week of clear nights.
  10. I have a good view of the eclipse. It's awfully boring for an eclipse. One side is a little darker. Just a little. (Used 8x42 binoculars)
  11. Ruud

    New to site

    Hello Steve, welcome!
  12. The purpose of the field stop in Stellarium is for the program to calculate a more precise true field of view. If you don't know the field stop, just leave the box empty. The program will then assume zero angular magnification distortion (amd) and will calculate the field of view based on that. Often angular magnification distortion differs from zero. It very commonly has a value of around 5%. I made a spreadsheet that calculates true fields from either known field stops or from apparent field of view and magnification. The formulas used are here: Scope Calculator Formulas.pdf And the spreadsheet is here: ScopeCalculator-2019-06-16.xlsx The "known field stops" in the spreadsheet are from the websites of the manufactures of the eyepieces. --- how does this help you with your question? If you cannot find the field stop diameter of an eyepiece you can use trial and error. Enter field stops until the spreadsheet calculates an amd of about 5%. Then you have most likely entered the correct field stop for the eyepiece involved. "Better" eyepieces like Ethos, Delos and Morpheus have amd values close to zero, and the manufacturers of such eyepieces are generally proud to publish their field stop diameters.
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