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GraemeH last won the day on March 22 2018

GraemeH had the most liked content!

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About GraemeH

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    Star Forming

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    West Lothian
  1. I can't remember if the frame count in the middle bar is for all loaded frames or only for the checked ones. Are your darks and flats checked in the file list?
  2. I set up with the intention of getting more data on M42 despite the proximity of the moon (I know it was a silly idea, but it's been ages since I saw a clear sky). It soon became obvious that I was wasting my time, but I didn't feel like switching my gear to shoot with my Edge HD8 so I just decided to grab some shots of the moon with my ED72 for some fun. This is a stack of the best 150 from 500 frames (1/250 s @ ISO100), prepared in PIPP then stacked in AS!3, gentle wavelet sharpening in Registax then final adjustments in PS CC.
  3. Spent a little more time reprocessing this one with a particular focus on trying to improve the colour balance. Managed to deal with the dark lines emanating from bright stars a bit more effectively in this version too I think.
  4. Thank you Martin - I think I agree with you about the colour. I just used Star Colour Calibration in APP and didn't make any other colour adjustments for now because it really needs more data to do it justice.
  5. I don't have enough data on this yet, but was just delighted to be able to get imaging again after almost 6 weeks of solid cloud cover. I guess it's pretty much compulsory to point at M42 every winter. This is just over 2 hours of 60" subs split roughly equally over 2 nights. Scope: Evostar 72ED Mount: Nexstar Evolution on wedge Camera: Canon 1100D (unmodified) Guiding: QHY5Lii-c and 9x50 finderguider Flattener: OVL non-reducing flattener Software: APT, PHD2, CPWI, APP, Photoshop Frames: 127 x 60" @ ISO1600, 25 Flats, 100 Bias Feedback and CC very welcome - thanks for looking. Graeme
  6. Others have already given perfect explanations of why Polaris isn't suitable for aligning an equatorial mount, but it is perfectly good for alignment of a Goto Alt-Az mount. The same arguments can be used to explain why a star near the zenith is bad for Alt-Az alignment (Alt=90°, Az=anything you like), but perfectly good for equatorial alignment.
  7. There are currently quite a few 6D mk I bodies available from https://www.mpb.com/en-uk/ for around the £500 mark.
  8. As far as I can find out, the Celestron 6.3 reducer has a backfocus design distance of 105mm. This means that you are correct that it isn't compatible with the Celestron OAG if you are using a DSLR or other long backfocus camera. If however you have a different type of camera with a shorter backfocus then the Celestron OAG would be an option. From the kit that comes with the Celestron OAG, the SCT adapter has an optical length of 25.3mm, the OAG body is 29mm and the male M42 and M48 adapters are 12.5mm, leaving you a total of 38.2mm for the camera and any M42 or M48 spacers.
  9. I prefer the first one - the second image has a little bit of a painted look, but I have to qualify that comment by saying that if I could produce something a quarter as good as either version I'd be delighted.
  10. I could be completely on the wrong track here, but I remember something similar when I used to have the JNOW option active in APT - there was always an offset between my solved coordinates and the framed view in Stellarium. I set everything (APT, EQMOD, PS2, ASPS, although I can't remember if all of them had an option) to use J2000 coordinates and then everything lined up perfectly.
  11. WIth my recently posted M31 mosaic, I had frames with wildly different background brightnesses due to having some subs ranging from either side of a full moon, through until just after new moon. For me, APP did a great job of normalising, using 1st order LNC with 5 iterations, but I think the thing that made the biggest difference to the background smoothness was setting MBB to 50%. Spending a long time in building a model for light pollution removal in APP made a big difference too, trying to follow the guidance from one of Mabula's videos on LP removal. I'm too new to APP to know how well these settings would apply to a different integration, but I guess it couldn't hurt to try. Graeme
  12. New revision of this image - as usual I was too keen to share what I had before I was really happy with it.
  13. I can confirm that HLVG definitely works with later versions - I have it installed in Photoshop CC 2020 and it works well.
  14. I'm now ready to call my project to image M31 complete, having reached a total of 17 hours 40 minutes on this. I've posted an earlier work-in-progress version of this previously in the Getting Started Imaging section, and I'm now ready to ask for some constructive criticism from the SGL experts. Equipment Details: Scope: Evostar ED72 Flattener: OVL non-reducing flattener Mount: Nexstar Evolution on wedge Camera: Canon 1100D (unmodified) Guiding: QHY5Lii-c with Skywatcher 9x50 finder Acquisition Details: 620 x 60", 28 x 120", 128 x 180" all at ISO 1600, captured with APT and CPWI Ascom driver with PHD2 guiding, in a 2x2 mosaic 100 Flats, 100 Bias, No darks Processing: Calibration, Registration, Normalisation and Integration in APP Light Pollution Removal, Star Colour Calibration and initial stretching in APP Final adjustments and cropping to give 16:9 ratio (to fit my screen as a wallpaper) in Photoshop CC Thanks for looking. Graeme
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