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Everything posted by geoflewis

  1. 2 superb presentations, thanks for posting them here, as I was not able to get to the PAS. Geof
  2. Looks great, just downloaded to my phone
  3. Göran , that's an excellent presentation of galaxies. It's great to see them together and each in a wider field context. Cheers, Geof
  4. Very sad to have missed this; it was in my diary, but at short notice my wife and I agreed to house sit and take care of 2 of our grandkids down in Surrey last week through yesterday, while our daughter and S-i-L took a trip to New York. Very nice for them and of course lovely for us to spend time with the grandkids and catch up with with other family and friends near our old stomping ground, but the PAS was a casualty for me.... Sounds like it was a superb event, so hopefully it will run again next year. Geof
  5. Just saw this on Astrobin Olly, it's a cracking good image . Geof
  6. Thanks again for the suggestions and feedback. Yes, I've wondered about removing the stars to process the nebula and stars separately before recombining them. I've not used stratton (other than a trial some years ago, which I couldn't work out), but my usual AP software ImagesPlus has a star removal tool which I do use for some processing, but I had a lot going on with combining short and long subs with Ha, so didn't try it for this image.
  7. Thanks for the info, based on your's and Donal's feedback, it is sounding increasingly likely that it is the filter's themselves that are to blame, if 'blame' isn't too strong a word. I inherited them with the camera which I bought 2nd hand, but right now I can't afford to upgrade them and also i'm broadly satisfied with my results despite the annoying halos. One day, maybe.....
  8. Hi Ian, Why not buy one and return if you don't like it. Having had success with the ES 68/40, I tried an ES 82/18, but couldn't get on with it so I returned it. Other than the cost of return shipping I got a full refund from TH (which included their shipping costs to me). That's one of the great benefits of buying on-line. Under the Consumer Contracts Regulations, you have the right to cancel at any time from the moment you place your online order, and up to 14 days from the day you receive your goods. Of course in the UK you might get 14 days of cloud, but..... Good luck, Geof
  9. That's excellent Pete, I gave up on Mars months ago and not sure how much if any planetary imaging I'll do this year with Saturn and Jupiter so low. I'll probably take a look, but think that I will mainly focus on some summer DSOs this year as I haven't imaged those for a while with the scope dedicated to the planets the last couple of summers. Geof
  10. I considered both the TV Panoptic 41mm & Vixen LVW 42mm, but after asking around purchased the Explore Scientific 68 40mm (ES 68/40) last year and have been very pleased with it for wider FOV with my C14 at F11. It gives me stunning views of M42 which just about fully fits the FOV, which was main reason for purchasing it. Geof
  11. A very nice image Emil and over 20 hours for your 1st NB image - impressive..!! I don't think I could wait that long to see how it turned out - actually I don't think I've ever shot that long for any image, but then other than Ha for enhanced red in RGB I don't shoot NB. Geof
  12. Thanks Donal, I've never captured more than 4 stars of the Trapezium with a camera, though I have seen E&F visually. Geof
  13. Hi Donal, I have thought about that, but as you say the cost of Chroma, or Astrodon filters is out of reach for me currently. I've also wondered whether the rear lens in the quadruplet TSAPO contributres to reflections as I know that when I've used that scope it for white light solar with a solar continuum filter, I can find 2 focus positions and depending on the magnification (Barlow, Powermate being used) I get both images appearing, one in focus one out of focus. Cheers, Geof
  14. Thanks Göran, I've been having trouble with those blue halos for some time and tried several ways to get rid of them without much success, so I'll see if I can improve them as you suggest. I previously posted about the M42 stars.... ...but so far no one replied. Many thanks, Geof
  15. Hi all, I don't recall a run of clear moonless nights in the UK like we had last week for a long time. I've just finished processing the 4 targets that I captured, so here they are..... FYI links to my Astrobin page where you can see capture details and full resolution images are also provide. Beehive cluster (M44) - https://www.astrobin.com/393156/ https://www.astrobin.com/393156/ Great Orion Nebula + Running Man (M42 region) - https://www.astrobin.com/393222/B/ Monkey Head Nebula (NGC 2175) - https://www.astrobin.com/393394/B/ Leo Triplet (M65, M66, NGC 3628) - https://www.astrobin.com/393867/ Thanks for looking. Geof
  16. WOW..!! That's a real cracker....
  17. Well here is my HDR image of M42 region. It comprises 25x120s each RGB, 25x30s each RGB and 15x120 Ha. I also captured 25x10s RGB, but didn't use them as the trapezium was well resolved in the 30s subs. I'm generally pleased with the final image (maybe my standadrds are not very high ), but I'm disappointed with the large halos around the bright stars and not sure what causes them, or how to fix them. I have attached cropped images of the worst stars for each stacked channel having applied the same arcsinh stretch. Clearly the B and G are the worst offenders, with the B suffering most from star bloat (dispersion?). if anyone can advice me what is the cause and how to fix it, either up front during capture, or in post processing that would be great please. Thanks in advance. Geof
  18. Hi Wim, I'm pretty sure that my stacking software ImagesPlus, doesn't have an option to use a bad pixel map, but I'll check it out. Good to know that I don't need to create endless libraries of dark masters for very short sub exposures. Again many thanks for the advice. Geof
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