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Ruud

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About Ruud

  • Rank
    Free-Floating Planet

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  • Gender
    Male
  • Interests
    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

Recent Profile Visitors

2,341 profile views
  1. A dozen new stars in Aquila!!!

    People do this because they think party lights are pretty and cheerful. They even put them on for the neighbours to enjoy when they are not out themselves. You'll gave to go talk to your neighbours, Michael, so good luck with the negotiations! Fortunately more often than not these things are solved to everyone's satisfaction.
  2. Identify this diagonal

    Congratulations. It clearly is a Takahashi. The two tubes on the prism shaped body are a dead giveaway. Takahashis have just that.
  3. Here is the manual for your telescope: https://s3.amazonaws.com/celestron-site-support-files/support_files/PowerSeeker_76_21044.pdf Indeed, it came with a 20 mm and a 4 mm eyepiece, and also a 3x barlow. The 3x barlow 'changes' the 20 mm and 4 mm eyepieces to 6.7 mm and 1.3 mm effectively. The telescope if f/9. If it is top quality you should be able use eyepieces with it having focal lengths as short as 4.5 mm. Any shorter (4 mm, 1.3 mm) will just give empty magnification: overly magnified dim and blurry images. A better set-up would be 32mm and 20mm eyepieces with a 2x barlow, the latter 'changing' the eyepieces to 16 mm and 10 mm effectively. All (32, 16, 20 and 10 mm) should be in the comfort zone of the telescope's optics and give you resonantly bright and sharp views.
  4. AR2671 is looking good today too 17-8-17

    Great images. Lots of clouds here, so thanks for keeping us informed on the state of the Sun.
  5. Actually, the Milky Way and the Andromeda galaxy are moving closer together. Should we invert our earlier considerations now? Or can we just handle things getting closer together and moving apart with a bit of blueshift and redshift?
  6. White light 16 August 2017

    Oh, that's a big one! Many thanks. It's a wonderful sketch.
  7. It's a beautiful image!
  8. I use an extension tube to turn my telescope into a long distance microscope. All it does is move the eyepiece back. It's just an empty 2" tube and it has a set screw. There are many models, some with compression and others without. Mine is among the ones here: Google image search You don't want too long a tube, because you still want to reach focus at infinity. Maybe you need something the size of a shorty Barlow (with the lens removed).
  9. Jupiter, the king of the planets!

    Great image, Avani! Thank you for posting.
  10. Help required as to what these are.

    Here is an Omegon diagonal which uses the same body: http://www.omegon.eu/omegon-star-diagonal-with-99%-reflection-2-/p,13318 They also have an erecting prism (1.25") that's very similar: The logo is different though.
  11. Cheapest is probably a mylar type filter (like Baader's ). That's for the partial phases of the eclipse. During totality you don't use a filter. Don't get absorbed by your camera. The eclipse will require all of your attention and it will over before you know. It will be all around you. It will be in the shadow of the Moon racing toward youfrom the horizon, in the colours of the sky, in the light and in the clouds. It will be in the birds and in the people. In all of nature. Use your camera to get through the slow, partial phases of the eclipse. Once totality gets near forget about the thing. Others will take pictures and theirs will be identical to any you might take. It would be nice though you could mount a phone and have it film you and your friends while you watch.
  12. 18 day Moon 11.8.17 at 3:00 hrs BST

    Beautiful images! I particularly like numbers two and six. Thanks.
  13. My New Orion VX8 Newtonian.

    Wow, Grumpy! It looks wonderful. Nice eyepieces too, and a good raci. It's awesome!
  14. Sol WL,HA,Proms AR2665-70. 10-8-17

    Great work, Charl. The artistic rendering really hit the spot. How did you make that? Thanks!
  15. Stellarium 0.16.0

    Wonderful! Thank you Alexander.
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