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Everything posted by linkahwai

  1. My Astro-Tech 6" Imaging Newtonian arrived. Here are the 2 current setups with iOptron iEQ30.
  2. My Astro-Tech 6" Imaging Newtonian arrived. Here are the 2 current setups with iOptron iEQ30. Canon 5D MkIII + Canon EF 100-400L + Orion Orion Mini 50mm Guide Scope + StarShoot AutoGuider + iOptron iEQ30 Astro-Tech 6" Imaging Newtonian + iOptron iEQ30
  3. Solar Observer 2010 Issue 1 (Solar Observer) is now available at: Solar Observer 2010 Issue 1
  4. The first and only solar astronomy magazine will be launch as a FREE e-magazine version in 2 weeks! If you haven't subscribe, please visit our website and subscribe: Solar Observer
  5. Our team is growing:) We will make it work:)
  6. We are a team of solar enthusiast who are planning to publish a magazine devoted to solar astronomy - SOLAR OBSERVER. At the moment, we are now in the stage of planning, as well as developing the website (http://www.linkahwai.webs.com/) and establishing the editorial team. We are looking for people who has passion in solar astronomy and who want to contribute to our magazine or the website. If you are interested in contributing the article, or be one of our team, please contact me: linkahwai@hotmail.com
  7. Thanks for reply. Now I get the point. Is that mean the node (longitude which cross equator) the farthest point in contrast to periapse? Why not the node is the nearest, since it is the nearest to euqator, I have not figure it out why... And what make the ring go backward in node? the gravity?
  8. From Nov issue of astronomy now (page 9): Because saturn is oblate rather than spehrical, its shape affects the orbits of rings, causing longitudinal of periapse (each ring's closest point to saturn) to precess, and the longitude where the rings cross equator (node) move backward by few degree per day. This is called differential nodal regression. What is longitude of periapse and node of saturn. Is this parameter the same as to description of Keplerian element of orbit? If the Saturn is oblate, then where is the point where the ring is closest to it? What mean of longitude here? Can someone explain me in detail? Thanks!
  9. Anyone experience with Thousand Oaks 0.9 Angstrom H-alpha Filter? Price less than $1000 sound like a good deal. How it compare with other, such as Coronado PST , or other similar filter such as Daylight H-alpha filter?
  10. Any online store in UK that sell Coronado PST which ship to Sweden? In Sweden, they sell it for almost 800 pounds. I saw it is only US499 elsewhere.
  11. During alignment, the frame alway go out of the planet, so most of the image become useless and can't use for stacking. Bye correcting with misalignment warming, double planet comes out. What is the problems? Any suggestions?
  12. Some more jupiter images, still couldn't get too much detail in high magnification, probably due to the low altitude and unstable atmospheric condition. Telescope: Celestron NexStar 8 SE, with 2x Barlow lens (second) Camera: NexImage CCD imager Exposure: 1/30s, 10fps, 499/1042 stack (first), 1/30s, 10fps, 923/1043 stack (second) Software: RegiStax 5, Photoshop CS3 Last image was captured by Canon Ixus 80 IS + NexStar 8SE + 32mm Plössl eyepiece, show the position of Galilean moon.
  13. After stacking 5 images of the moon by Registax and proceed with Photoshop, the detail improve significantly:) Camera: Canon EOS 400D Lens: Canon EF 70-300mm f/4-5.6 III lens F-stop: f/8 Exposure time: 1/30 sec ISO speed: ISO-100 Software: RegiStax 5, Photoshop CS3 1st pic: single layer without processing 2nd pic: 5 layer with RegiStax and Photoshop
  14. Some more jupiter pics today:) Telescope: Celestron NexStar 8 SE Equipment: 2x Barlow lens (first 2 pics) Camera: NexImage CCD imager Exposure time: 1/30s Frame rate: 10fps Software: RegiStax 5, Photoshop CS3
  15. First try on jupiter, processed with RegiStax and Photoshop, a bit dissapointing, need to work hard on it:)
  16. Another trial today... Camera: Canon EOS 400D Lens: Canon EF 70-300mm f/4-5.6 III lens F-stop: f/8 Exposure time: 1/30 sec ISO speed: ISO-100 Software: Photoshop CS3
  17. First trial on photoshop processing for color image of moon. Photo taken by Canon 400D with 75-300mm lens. More info in my blog: Kah-Wai Astronomy Blog
  18. Anyone had experiences with the wedge for Celestron NexStar 8SE? Heard a lot of negative about the wedge on this scope, and couldn't find too much info on it. Is it worth to invest?
  19. Anyone had any success with deluxe tele-extender?
  20. did you use the eyepiece with tele-extender?
  21. Didn't heard too much about tele-extender with DSLR, can it produce good quality image over NexImage?
  22. I was thinking to get the accessories for lunar and planet imaging: 1. Celestron NexImage CCD camera 2. T-ring + Celestron deluxe tele-extender couple with my Canon EOS400D Which one is a better option? Any other suggestions?
  23. Here are some pics of my new Celestron NexStar 8 SE and accessories:) http://astrokahwai.blogspot.com/
  24. A few more shots on moon. Haven't order the T-ring and T-adaptor for my Canon EOS 400D, so just take the pics with the compact camera Canon Ixus 80 IS. Kah-Wai Astronomy Blog
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