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Ben the Ignorant

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About Ben the Ignorant

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    Star Forming

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  1. Your simple mirrors are stranger than you think

    I had never heard of that Zuka scope, Bing finds no picture of it, and Google finds only three, from the same Astromart page! Must be pretty rare; I'm not sure what kind of diagonal was added in order to use it parallel to the natural line of sight. I think we all need to work on our visualization skills!
  2. Your simple mirrors are stranger than you think

    But the main mirror reflects light along its optical axis, whereas the secondary does so 90° away from the main mirror's axis. This is tougher to represent in the mind's eye than I thought!
  3. Your simple mirrors are stranger than you think

    I put a newtonian tube on a table, facing an electrical post, a pine tree to the left, and a leaf tree to the right. With the focuser held vertically, I turned my back on the landscape, and saw everything "correct" in the eyepiece. Post is upright, pine tree to the left, leaf tree to the right. Later I rotated the tube around its horizontal axis so the focuser went from vertical to horizontal, and sat at the standard place for looking through a newtonian: on the side. The post's bottom was first in the left part of the image, and when rotating the tube, the post's bottom turned from 9 o'clock to 12 o'clock. Will have to try that with my little SCT. Funny that a newtonian does work as terrestrial scope, but only if you turn your back on your target!
  4. I own a 130mm (f/7) newtonian, and I have used 114mm, 150mm and larger scopes of that type. For mostly looking at the brighter, easier stuff, a 130mm is quite gratifying, but more of the fainter stuff requires a 150mm for me. Thus I would not advise someone to get a 114/115mm, that aperture is almost toyish for a reflector. Get the 130 that costs nearly the same, anyway, plus it's easier to use.
  5. Plus, it's explained by a crazy guy! Why can't school teachers be like him?
  6. I hope you win the lottery; doesn't have to be the biggest prize to allow you to keep your scope.
  7. Astro related retirement present.

    I would suggest the same as daz, a large binoc (which weight can you handle?), or since your signature indicates you're visual, some ultra-wide angle eyepiece. By the way, I also have a Sigma guitar (a full-mahogany 000M-15); they don't have to envy their Martin counterparts, right?
  8. Waaa what a surprise!

    Nice catch! I had never seen a pic of a weather balloon taken through an amateur stargazer's telescope. When I was a kid the local newspaper talked about people confusing weather balloons with alien spaceships, but despite the many articles over the years, the paper never showed a picture of a weather balloon, and didn't even print a written description! This was so frustrating! Luckily now we can access these images to make up our minds about them, or even take these pics ourselves.
  9. Sincerely, I have to watch it again a couple times before I can comment on it, folks! Because some phenomena are common doesn't mean they are simple or straightforward.
  10. Your simple mirrors are stranger than you think

    Interesting remark, Louis. I am going to rest a newtonian tube on a table, aim it at a landscape, and try various orientations of the focuser, plus various orientations of my head to sort this out.
  11. Hello from Hungary

    Hi! What kind of observing site and gear do you have?
  12. SW Evostar 120ED vs Startravel 150?

    Of course, not! I have an achro, a SCT, two newtonians and one apo. What makes the difference between enjoying them or not is collimation, not optics type.
  13. SW Evostar 120ED vs Startravel 150?

    The answer is two-fold: The YouTube guy did find a tiny bit of fringing because the glass is in the FPL-51 class. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ http://www.davidesigillo.eu/test_120ed.html http://www.davidesigillo.eu/test_127ed.html The italian reviewer (a professional optician who improves scopes and eyepieces) finds more fringing in a Meade 127mm (otherwise excellent) FPL-51 triplet than in a Sky-Watcher 120mm FPL-53 doublet. Sorry for the german and italian languages but I take info where I can find it.