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johninderby

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Everything posted by johninderby

  1. Photos are never as sharp as visual or at least not in pre lunar orbiting camera days. As the LAC charts are drawings perhaps they combined visual observations and photos to arrive at the finished drawing.
  2. The crater illusion https://www.universetoday.com/118616/do-you-see-a-mountain-or-a-crater-in-this-picture/
  3. Just the angle of the illumination I would think. Here’s another image at more of an angle.
  4. At this rate Derby will be a seaside city before you know it.
  5. I use a Manfrotto 475 geared tripod with a modified 405 geared head. Bigger and heavier than the light duty 55 series but still easy to carry the full setup outside one handed.
  6. I have a Concenter and now consider it essential. No other method comes close in getting an accurate secondary setup. It is very easy to use. I use a Hotec laser for adjusting the primary afterwards. Gives me perfect colimation. The Concenter on it”s own will still allow you to adjust the primary reasonably close but I find the laser easier. You could skip the laser and fine tune the primary using a star test afterward of course. APM has a wider range than TS though. https://www.apm-telescopes.de/en/othernbspaccessories/artificial-stars
  7. WDS Ltd is a great source for knobs suitable for astro gear. You’re sure to find something suitable on their website. Bought loads of bits off them. http://www.wdsltd.co.uk/categories/65/hand-knobs-thumb-screws/
  8. I have questions yet to ask that might contradict that. But seriously it’s not asking questions that is stupid.
  9. I wonder if I should replace my car with one of these??? https://www.seamagine.com/luxury-submarine-5-person.html
  10. Forecast is showing maybe for Sunday night. Dry so far today but looking very wet for tomorrow. ️️️
  11. You can get the proper stuff from Edmund Optics. They do glues with different refractive indexes so one more complication and probably too expensive for your project. https://www.edmundoptics.co.uk/f/norland-optical-adhesives/11818/
  12. I want to see some proper activity.
  13. And bring a zoom so you can try different mags to see what works at the time.
  14. There are supernovas and there are SuperNovas. This pic might not make sense unless you’re in North America though..
  15. Started foggy but now just cloudy and grey and damp.
  16. According to the manual only the 1.25” adapter is included with the scope. Also the adapters are bigger than 2” at the bottom so not possible to fit the 1.25” adapter into the 2” one. Why didn’t Skywatcher make the focuser drawtube openning 2 inches who knows?
  17. Sounds badly oit of collimation if the focuser is moving that is. . Also with that focuser ypu have to buy an optional adapter to use 2” eyepieces.
  18. Interesting to,compare the LAC chart detail of Plate to a high res image.
  19. Gping to download the full set onto my iPad so will have them handy.
  20. If you click on the one of the charts you can download them in three different resolutions. There used to someone on eBay who used to sell prints of them. https://www.lpi.usra.edu/resources/mapcatalog/LAC/ Such as https://www.lpi.usra.edu/resources/mapcatalog/LAC/lac12/300dpi.jp2
  21. Here you go. https://www.lpi.usra.edu/resources/mapcatalog/
  22. That’s why a zoom eyepiece is so useful. Find the right mag then switch to a regular eyepiece once you know what the seeing will allow.
  23. Was clear half an hour ago. Now can barely see the house a across the street.
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