More of the Eastern Veil Nebula using the Optolong L-Enhance dual narrowband filter...
I processed these images using my typical narrowband imaging workflow: calibrating the RGB subs, splitting the subs into R/G/B channels, then processing each channel separately.
Imaged with WO GT81 at F4.7 (382 mm focal length) using Flat6A II field flattener/0.8x reducer, Optolong L-Enhance dual narrowband filter, and full spectrum modified Nikon D5300.
Pre-processed using PixInsight Batch Pre-Processing (BPP) script. Images calibrated using darks, bias, and flats. Extracted red/green/blue channels using BatchChannelExtraction script. Registered and stacked using StarAlighment and Integration. Total integration time of ~7 hours using 70 subs at ISO400x360 sec. Post-processed in Pixinsight: Cropped, gradient removal with ABE, MLT for noise reduction, stretched using Histogram Transformation Tool, Curves Transformation, TGVDenoise for noise reduction, HDR transform, Local histogram transform.
NB Version 1 = Blue Channel (Hb/OIII)
NB Version 2 = Green Channel (OIII/Hb)
NB Version 3 = Red Channel (Ha)
Version processed as OSC RGB image:
https://astrob.in/n29ib1/0/Note: I ended up re-doing the processing and re-posting all of these images. I used StarAlignment to register all of the processed images before using DynamicCrop to crop them all the the same size. I made the mistake of checking the Frame Adaptation option the first time through (something I don't usually do, but learned about while working on a PixInsight mosaic for the first time). Turns out that option does some scaling and the result didn't look as good as the originals. So, I re-processed without. Will need to learn some more about that one...
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