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Gina

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Everything posted by Gina

  1. Yes, really substantial hardware that! I have the same.
  2. Here are a few screenshots of KStars showing the coverage I shall get with the 105mm lenses. Angelfish.
  3. Many Happies Mere youngster!!
  4. I have dismantled my single imaging rig and working on the dual. I can certainly use that as a single rig and may even have dual imaging ready by Monday. Wish me luck.
  5. Sunday is a very small possibility. Monday night may be better. But with rain for tonight and tomorrow night virtually guaranteed, definitely nothing until Sunday.
  6. Raining here. Now there's a surprise!!!
  7. Now printing the focuser parts for the second lens.
  8. This rig has 105mm f2.8 lenses so wider FoV than the 135mm but I have a pair of the Asahi super quality lenses and only one 135mm though I have poorer ones. It'll be interesting to see the difference between the 135mm and 105mm lenses. I've had good results with the 105mm lenses in the past but I've been getting very pleasing results with the 135mm with better camera settings..
  9. Now 3D printing more parts for my dual imaging rig.
  10. A couple of photos of the part completed rig. Needs focus mechanism for LH lens and dew shield also the extra electronics for the 2nd camera & focuser. Then I need to add dew heaters to both dew shields.
  11. I've ordered the 16 heavy duty 500mm square grids to make up the yellow path in the diagram.
  12. The camera without a filter wheel will have a 1.25" filter mounted in an adapter right on the camera. All these parts are supplied with the camera. Next to the camera, 7, is a ring with internal T2 (M42) thread. Inside that goes an adapter, 6, from M42 to the 1.25" filter thread and inside that a standard 1.25" filter, 5. In this case an Astrodon 3nm OIII filter. The filter couldn't be any closer to the camera so vignetting will be minimal (even better than with the ZWO EFWmini on the other camera).
  13. Errr... Yes... I rolled into it! I guess I could move it...
  14. Back to astronomy... I'm thinking I might as well go straight to continue building my dual imaging rig rather than modifying the single one again. The so-called "dual imaging rig" can function as a single until it's all built.
  15. Rural living costs more generally due to needing a car to get to the shops etc.
  16. Rain has eased off even if the wind hasn't!! Been out and brought my imaging rig indoors to work on. On a different tack - my car is back complete with a bill for twice what I was expecting Fortunately, my pension has just gone into the back so I have enough to cover it. Why is my bank account always running on empty??? Oh yes, I'm an astronomer Q.E.D.
  17. Focussing on bright stars with 3nm filters is no problem though it depends how sensitive your camera is. I generally use an exposure of 0.1s, setting a ROI of 500 or 1000 px square, offset to catch the best stars in the FoV. With a telescope with several stops less aperture you may need to use 1s exposures. Of course you need to have software that allows you to adjust the focus for each filter. I guess you could say your telescope is wrongly specified in being called APO because it clearly isn't (unless there's something wrong with your filters).
  18. I had to do that with my build. I bought two in fact - the first wasn't big enough. Tied mine on with rope and used lengths of timber to support it/them. Yes, they were cheap and didn't last long but long enough to do the job. I spent many days (weeks, months) under tarpaulin building my observatory. You can't rely on good weather in this country!! ('Tis true )
  19. What telescope is that Dave? You've probably said in the past but I forget.
  20. If you have a good APO telescope and filters all by the same manufacturer, you should get the same focus over the whole visible spectrum. One advantage of a Newtonian is that it is automatically apochromatic as there are no lenses to cause chromatic aberration.
  21. One thing to consider with lenses intended for terrestrial photography is that they are not fully apochromatic (APO) into the deep red where Ha and SII wavelengths lie. This means that you need to change focus when changing filters. For RGB you may notice a change in focus for the Red whilst the Luminance image looks rather soft.
  22. If we get a break in the rain over the next few days I may bring my imaging rig indoors as it needs work on it. Otherwise I shall probably be staying indoors.
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