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By Stub Mandrel
Back from a break 🙂
A productive evening was the 22 November. I have a strange field of view at home, so along session means I get data on several targets, and at this time of year I often can't revisit for more data. This means these images need to be seen as 'works in progress' that will need more subs adding in the future. Also, I've used Jpegs because my broadband is playing up some of the subtleties are lost (he claimed!) 😞
All Baader narrowband filters, except the Plieades, ZWO RGB. 130P-DS, ASI1600MM-pro and HEQ5
The Tadpoles NGC1983 in Hubble Palette:
The California Nebula HSO, with the S from an evening a few weeks later. No Oiii under my skies. The FOV is a bit limiting with this setup:
Which do you prefer? Pacman in Hubble (SHO) and HSO, in contrast these are crops from a larger frame:
Finally, the Pleiades in RGB, knocked off at the end of along evening so just 75-second subs and not very deep:
All in all, a worthwhile evening, even if my Witch Head was a complete fail and these do need more data next year 🤞
2020 hasn’t been a great year for anyone, but we’ve had a good comet, and some clear nights. I haven’t been the most productive, or even a very good imager this year, but I’m quite pleased with what I’ve learnt, narrowband has been a revelation . So I thought I would share a few of my images, and a video I put together or them. Thanks for all the great images and tips that have been posted. Wishing you all a happy Christmas and a great 2021.
Recently I bought a ZWO ASI178MM for planetary/lunar/deep-sky imaging and last weekend i had clear skies so I was able to capture videos of the moon in two panels. I have already processed the videos in AutoStakkert, I used 3x drizzle because I intend to print the image so now I have two 120MB TIFF images that i would like to combine in a two panel mosaic. I tried doing it in Hugin, a free panorama stitcher but the program crashes due to the file sizes being too large. I have searched for tutorials on using DynamicAlignment in PixInsight but it seems to me that i'll need a reference image to be able to create mosaics in PixInsight. Is there any way to go about this, I feel like this should be a pretty straightforward job but I am not very experienced in PI so I would really appreciate some advice.
I tried using DynamicAlignment as you can see in the attached screenshot but the result was just a cut version of the target image, aligned perfectly to the source image. It would be perfect if it didn't cut off the lower part of the target image.
I have a huge problem with DSS.
About a week ago, I took 300, 2 second long exposures of Andromeda with my skywatcher 90/900.
But when DSS started scanning the stars in the images, it only registered about 5 stars at 40%. And only 7 stars at 20%. I tried to stack them and selected stack 100% of frames, but it only stacked around 29.
I even tried it at 4% where it registered around 40 stars, but DSS crashed mid process due to the immense amount of stars being scanned (60 000 per image at least).
I tried it sooooo many times, but I don't get it to work. It somehow stacked 131 images I took of the lagune nebula (1 second lang exposure). You couldn't see the actual nebula, but some bright stars were there and DSS was able to stack.
In the Andromeda pics, there were like 5 times more stars, but it didn't work.
If anyone knows what's wrong, pls help me!!! I'm slowly loosing it on that nonsense.
I'm trying to stack 240 light frames of Milky Way taken from quite a light polluted area.
I tried to stack them in DSS. The Milky Way seems to have been stacked okay, but the surrounding stars look like they've been deliberately dimmed or brushed over.
I thought there was something wrong with my frames but when I used the same frames in Sequator, it's working fine.
I've attached both the images below, and I have exaggerated them a lot on Lightroom just to see how much details I could pull out. Sequator one seems to have too many weird light bands(?) but I think I can fix them using an adjustment brush. But look at how many stars Sequator is able to show compared to DSS.
DSS image: The settings I've tried on DSS and yet nothing changed:
1) Tried in Standard, Mosaic both
2) Tried both Sigma Clipping, and Auto Adaptive Average(These two were recommended by DSS)
3) Hot pixel detection and removal (tried it with enabled and disabled)
4) Nothing enabled in the cosmetics tab
5) Tried with and without Flat frames
6) Star Detection Threshold: Tried from a range of 50 stars to 300 stars. Even manually checked to see if DSS was picking any noise as star(it wasn't).
If I try with less than 30 light frames, DSS does an okayish job and the stars in the rest of the image still look like stars, but then the Milky Way has no details to pull out, unless I stack a lot more shots.
Can anyone please tell me what am I doing wrong in the case of DSS that it's doing such a poor job for the surrounding stars? If you guys need me to upload some Raw light frames I will do so as well. Any advice and suggestions are welcome. Thank you
Camera: Nikon D3100, with 18-55mm kit lens
Exposure Settings: F/3.5, ISO 3200, 15s x 240 frames, 18mm focal length, no tracker
50 Darks, 50 Bias and 50 Flat frames.
DSS version: 4.2.3