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markarian

Advanced Members
  • Content Count

    188
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63 Excellent

About markarian

  • Rank
    Star Forming

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  • Website URL
    https://www.forthimage.co.uk

Profile Information

  • Gender
    Male
  • Location
    Edinburgh
  1. markarian

    Ha showing secondary image

    First check is that MPCC distance is wrong. I've adjusted it (not totally correct yet but I'll sort that) and at first glance the pattern has gone! May have been chance that the position I chose just happened to produce a very nicely focused image of the spider and secondary! I'll do more tests to be sure. Mark
  2. markarian

    Ha showing secondary image

    Yes Baader MPCC. Spacers may not be exactly correct - I will need to check that out. Thanks everyone for your help. I have a few things to try out now. Mark
  3. markarian

    Ha showing secondary image

    From the calculator above I suspect I may have 2 possible sources: Coma Corrector and EL lightbox. Can try and eliminate both to prove the point. M
  4. markarian

    Ha showing secondary image

    SX filter wheel. Will check. Are filters not coated both sides?
  5. markarian

    Ha showing secondary image

    They are screw in filters so no other way to go in that I can see.
  6. markarian

    Ha showing secondary image

    Thanks vlaiv - will give those a go. Filters were new Louise. Mark
  7. markarian

    Ha showing secondary image

    One other possibility is the acrylic over the EL panel I use for flats being reflective? Suppose I need to try and change everything to see what works.
  8. markarian

    Ha showing secondary image

    The weird thing is the flats - they show an almost perfect image of the primary, secondary and spider. Final images show it too.
  9. markarian

    Ha showing secondary image

    Flats and subs all show the same in Ha and OIII. SII doesn't show these that I can see. The only thing that's changed is that this is the first real full narrowband image I've done - so a big change really Wondering if it's out of focus reflections from the MPCC to the Baader filters? Mark
  10. markarian

    Ha showing secondary image

    It is an unstacked sub but you can see the same pattern in both the sub and the flat. All subs in Ha and OIII have this. It was reasonably dark last night (or as good as it gets here on the edge of Edinburgh) so don't think it was against light. Both images seriously stretched to show the issue. Thanks
  11. Need some help with this please. Just started narrowband imaging with Baader filters and I'm seeing some very strange effects that I can't explain. Anyone seen this before and how do I get rid of it? Basically it looks like the primary, secondary and spider are showing up on the images. Here is a 200s sub in Ha (2x2) and an associated flat. I get seomthing similar for OIII too - but not SII. Telescope is 250mm f4.8 newt with an MPCC, Atik 460EX and Baader filters. Thanks Mark
  12. until
    Talk by Dr Paul Dalgarno, MPhys PhD CPhys, Associate Professor of Physics at Heriot Watt University . Black holes remain one of the most fascinating and intriguing phenomenon of the universe. On the one hand they are conceptually amazingly simple, on the other we still know very little about the detailed complexity around them. This talk will discuss the history of our understanding of black holes, some of the main properties of them and touch on some of the deeper questions connected to them. Regular meetings are held monthly and are open to members and non-members. Admission is free and visitors are always welcome. Also at our meetings: What's in the night sky this month News of what's happening in the world of astronomy and space Occasional member presentations Tea/coffee and chat afterwards
  13. until
    Talk by Dr Andrew Dennis, Director of Product Management at Andor Technology. When we think of Astronomy we think of beautiful Astrophotograpy images, but behind the scenes there are usually a vast array of “technical” cameras which ensure the telescope remains aligned, perform deep Astronomical analysis or produce details of the chemical composition of far off worlds. To make a Hollywood analogy, these cameras could be considered to be the Screenplay writers, Producers, Visual effects engineers of the Astronomy world, without these cameras the “lead actors” simply couldn’t perform. Regular meetings are held monthly and are open to members and non-members. Admission is free and visitors are always welcome. Also at our meetings: What's in the night sky this month News of what's happening in the world of astronomy and space Occasional member presentations Tea/coffee and chat afterwards
  14. markarian

    NGC 1514 - The Crystal Ball Nebula

    I found this object the other night, never having heard of it before. It is lovely. Your image is much better than I managed - sky wasn't too transparent and ice forming on everything. Good one! Mark
  15. markarian

    Supernova 2018 ivc in M77

    Imaged this last night - first supernova for me. A little tricky to keep it from being lost in the core but it's definitely there. Mark
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