With clouds being on and off the past several nights, I have been fortunate enough to finish work on my NGC6888 Crescent Nebula image in Narrowband Bicolour Palette. For this image, I therefore only opted to capture Hydrogen-Alpha and Oxygen-III data. It is an object I have imaged numerous times before but never at this focal length, and I am astounded as to how much fine-structure I was able to capture.
In total, this image comprises 30 hours of exposure time, with 60 exposures in total (30 exposures per filter). As with all my narrowband imaging, each exposure is 30 minutes long. During imaging of this target, I had to delete and re-capture a few exposures, making me take longer to finish than previously planned. I need to improve the focus on my autoguiding camera so that guiding is more reliable and I also need to re-balance my mount slightly. I have yet to fix the imbalance of having the SnapCap on the left side of my telescope aperture, with no equal counterweight on the right side. This can at some angles cause some star elongation, particularly with 30 minute exposures, despite excellent guiding and polar alignment.
In any case, I am happy with how this image turned out. It is impressive on normal-sized screens, as it is only one panel and not a mosaic. On my new Samsung QLED 55" Q7FN 4K HDR TV that I use as my computer monitor, it seems a little blurry. Then again, I am slightly over-sampling the sky at this imaging resolution.
In any case, I am happy with how this image turned out. It is impressive on normal-sized screens, as it is only one panel and not a mosaic. On my new Samsung QLED 55" Q7FN 4K HDR TV that I use as my computer monitor, it seems a little blurry. Then again, I am slightly over-sampling the sky at this imaging resolution.