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glowingturnip

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glowingturnip last won the day on March 19 2014

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About glowingturnip

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  1. Well Covid-19 put a massive dent in my imaging this year, since my kit is in Spain and it's been really hard to get out there. This is the first new work I've done this year, about 11 months after my last one. So... how is everyone anyway ? Here it is: Bubble Nebula (NGC7635) by Stuart Goodwin, on Flickr About 20 each of 900s Ha, Oiii and Sii, darks flats and bias, equipment as per sig, Pixinsight. I went for the (Ha, Sii+Oiii, Oiii) palette since I wanted something closer to natural colouring than the Hubble palette gives, especially since the different bands are quite different weights in this target. To be honest, getting a colour palette I liked was quite a struggle until I eventually had the idea of nudging it a little bit on the hue wheel - after that and some PI curvetool trickery, I'm quite pleased with the result (depending which monitor you believe, of course) As an aside, we finally managed to get functional wifi and Netflix in our remote valley in Spain, so I think I managed to send myself half doolally binge-watching re-runs of The IT Crowd while capturing this. The Bubble Nebula (NGC7635) is an emission nebula in the constellation Cassiopeia. The "bubble" is created by the stellar wind from a massive hot young central star 44 times the mass of our sun. The nebula is in a giant molecular cloud which limits the expansion of the bubble while itself being excited by the hot central star, causing it to glow. It was discovered in 1787 by William Herschel. Hope you enjoy ! Stuart
  2. It was pinched optics in the coma corrector from being screwed on too tight (not that anyone cares, it seems ) Still not sure why the flats didn't pick it up though. Anyway, did a run of OIII on the Crescent last night, not a hint of banding
  3. jetting off on Friday, hoping to get a bit more imaging - quick nudge to see if anyone has seen anything like this before ? Cheers
  4. Apologies for bumping an old thread - Covid has meant that I've been locked down away from all my kit for most of the year - I hadn't actually imaged anything since October last year until I had a go last week. I've still got this banding issue unfortunately. I shot a new target, and could see the exact same banding pattern on my OIII and SII channels this time too. So that's three targets, all different parts of the sky and different times of the year, and all showing the exact same pattern in the exact same part of the frame as it comes out of the camera. My flats don't show the pattern at all, and I redid my master darks and bias and don't see the pattern there either. The pattern is visible in the raw lights, and the flats don't remove it. I've had all the filters out prior to the last attempt - all are clean and don't have any scratches, and unless I was extremely unlucky, the filters would have gone in with a slightly different orientation, and yet the pattern orientation hasn't moved. That, plus the pattern being visible in both OIII and SII leads me to deduce that it's not the filters. Nothing is fouling inside the camera - the shutter plane can rotate freely, and the filter wheel isn't rubbing on anything. It's a Newtonian with a coma corrector - so the only optics in the way are the two mirrors and the CC. It has an OAG I'm thinking: - light-spill/internal reflection - possible, and wouldn't appear on the calibn frames, but difficult to see how, I'm very careful with any external light when I'm imaging, and given that the three attempts were different times of year and different sky positions and yet the pattern is always the same, then it's unlikely to be reflection down the open end of the tube. I always cover the mirror end of the tube with black-out cloth so it can't be from there - maybe it's some specific light spill around the OAG, but difficult to see how - pinched optics on the coma corrector - it is screwed in very tight since to get the spacing right I actually have very little thread left to screw it on with and don't want the camera falling off (I have a safety tether), but if it was that, then presumably the flats would correct it - sensor issue - obviously my worst scenario, but then again the flats should correct it - warped/pinched mirrors - again the flats should correct it, would have thought the effect would be more blurred too Can't think what else it would be, so given the above I guess I have to be looking for a light spill - any other ideas ? I should get another chance to test soon (in Spain, so looks like I'm going to have to quarantine afterwards) - guess will try: rotate camera 90 degrees, see if it moves; try without CC; try with/without a big black cloth over everything but the end; with end covered but rest uncovered. Anything else to try ? Cheers, Stuart
  5. I had some success in testing in getting my laptop and a tablet to talk to each other using teamviewer by using my phone as a mobile wifi hotspot and both connecting to it, but to be honest haven't used it in the field - I think just the pain of setting it all up and worrying it would upset everything else on the laptop outweighed the lesser pain of padding outside every other advert break
  6. I've got another one actually - this one's a quintuple system in the middle of the Rosette: I think we imagers tend to capture them by accident though - according to Wikipedia, about 1/3 of the stars in our galaxy are multiple systems, so I've captured hundreds of them
  7. I did Albireo a while back too, but seem to have lost it. Here's one that a lot of us may have inadvertently got - Alnitak and its double:
  8. fair comment re the stars - I usually use a tone-map technique like this for merging my channels which gives the flat white stars as in my original image. It does give me headaches on the brighter stars around my newt spikes though. For the reprocess I actually borrowed some star colour from a previous DSLR image of mine - maybe it should be feathered in a bit more
  9. I agree, I do seem to lean to the dark and stormy side at the moment - must be typhoon season in the Lagoon
  10. Yes indeed, isn't that always the way ! Thanks for the nice comments all
  11. Ok, I know it's not the right season at all for the Lagoon, but I fancied a reprocess of this data. It was my first go at SHO narrowband, and I've got plenty of data, but my experiences processing narrowband since led me to think that I should be able to pull out much more detail than I had before, so here goes: 16 each of 600s Ha, Sii and Oiii taken over 3 nights in summer 2018, darks flats and bias, equipment as per sig, Pixinsight. For comparison, here's the first version and the thread on it: What do people think - improvement ? Anything more I could be doing with it ? Hope you enjoy, Stuart
  12. Only 3 photos for me this year (!), two of the below are detail shots, but I'm pleased with what I managed - loving my long focal length plus narrowband detail Rosette (HOO): Ced 214 (SHO) + detail: Swan (HOO) + Ha mono detail: Equipment as per sig
  13. think you need to get yourself a cheshire eyepiece and sort that mirror out
  14. what channel combination did you use if you don't mind me asking - HOO or something else, and did you boost the Oiii to match the Ha before merging ? I've got a similar HOO picture to yours, but mine's much more brick-red, I like your colours better:
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