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  2. There's a location near here where someone reported 45 stars. I'm struggling to credit that, I have to admit. It might be interesting to look at what kind of magnitude stars we're getting down to for that sort of figure. James
  3. Great looking scope Stu It would be very interesting to put that up against a top 6 inch apo refractor. It looks like it's from the same era as my 12 inch. The focusser and extension tube on your scope are the same that my 12" F/5.3 came with originally.
  4. There is another SGL thread on this: I agree that the data is very inconsistent and rather inconclusive.
  5. Oh Stu, a 8" f/8 with 1/10th wave! It can only be wonderful. Looks amazing too! Congratulations :)
  6. Agreed, around me in the outskirts of SW London if the results are to be believed the sky goes from Dark skies to Very severe light pollution...... In reality it varies a lot due to the atmosphere, time in the evening, where the moon is, and where in the sky the object you are looking at is (if it is fairly overhead you are in business). With a CCD I can easily get below mag15 so I'm happy.
  7. The app is simply duplicating the hand control functions so Just follow the procedures from the hand control manual.
  8. Perhaps because fewer people own DSLRs these days thanks to phone cameras, so buying a dedicated astro camera seems more logical than a DSLR that wouldn't get used for anything else anyhow? Though personally I think I'd almost always use my DSLR for really wide field shots, at least until I can afford something with a sensor of a similar size. James
  9. More food for thought, thanks. My plan to copy John's idea for my 10" GSO Dob has been scuppered by the lack of the smaller opening in the 10" top cover. No worries, though, I'll take Ben's suggestion and get a filter for my 127 Skymax. (I'm dangerously tempted by a PST though, I made the mistake of viewing some of the youtube videos of them, together with their results !)
  10. The trend seems to be moving towards dedicated CCD /CMOS astro cameras. Keeping up with the proprietary DSLR interface changes as new ones come out is tough for developers.
  11. The simplest dehumidifier would be to blow the air through packets of silica gel which would need replacing every so often with fresh or dried packets. However, experience has shown that the silica gel gets "full" pretty quickly even with the air indoors. The other way is to cool the air below dew-point so that the water condenses out. I could do this with a Peltier TEC. Of course the dried air would then need heating otherwise the dome will be cold and dew will condense on the outside. I guess the cooled and dried air could be passed through a heat exchanger on the hot side of the Peltier TEC and warmed up for feeding up into the dome. This would become a combined dehumidifier and dew heater. Hmmm... I wonder...
  12. Thanks Shane, It is gradual, in a similar way nebulae and galaxies reveal detail gradually. I don't really stare directly at the planet but let my eye naturally scan the disc. That way subtle detail can often flit in and out of view as the turbulence comes and goes. Obviously, its not easy to accurately place features on such a tiny disc, so the sketch is just a rough representation of how things may appear in a small scope at high power.
  13. Haven't got much done this week, but over the last couple of evenings I've been tidying up in preparation for painting the scope room, which I hope my daughter will help with tomorrow. I even took a hoover down and to get rid of as much of the dust as possible. Disappointingly the removal of the dust revealed this: Looks like a rodent of some variety has been nibbling at the edge of the floor I'm slightly tempted to get some steel or aluminium angle and screw it over the edges, though clearly I'm going to need to put some "rodent deterrent" down there somewhere. Last job this evening was to remove and number all the pieces of aluminium section for the lighting. They can go back in once the painting is done, but taking them out makes the whole job a lot quicker and simpler. James
  14. Nice work. Big thanks for sharing your data. I certainly need to practice more. I have downloaded your files and tried processing using APP and PI but I am really struggling to handle the light pollution. Your final image is way better than anything I can do with your data so far, well done.
  15. Thank you. I updated firmware before I turned the mount on. As for the manuals, there is no manual describing app functions and alignment methods. It appears that there is no quick solar alignment, but at the same time I have no idea what point and track is and how it works. Celestron has solar system alignment and it works beautifully, no need to point north, just level.
  16. Yes, that is just what I was thinking as an alternative. I shall have to think how I can manage it. Ideally, dry(ish) air from inside the observatory. OTOH is the air in the observatory dry? Alternatively, I'm wondering if I could make a tiny dehumidifier.
  17. Today
  18. 4 hours into the print and it's gone wrong!
  19. That's interesting John. Looking forward to trying it out properly, probably going to have to build that dob mount first though. Not sure I fancy balancing the Gitzo on the EQ Platform!!
  20. Mosaic of seven shots through a C6 with x2 barlow. I always like this region. Trevor
  21. If a scope is perceived as being overpriced new, the standard used 2/3 pricing of new pricing ain’t going to get many takers.
  22. They've been feeding up..... on me!
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