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Went out on Sunday night to try and get some OIII for the Veil Nebula Bi-Colour Mosaic I’m currently working on. It ended up being a largely frustrating night though as I was fighting a big, bright full moon (in hindsight not the smartest decision I’ve ever made in fairness, lol). Factor in just enough intermittent clouds to exacerbate the issue even more, and when it finally set behind the neighbour’s house at 03:30am I was feeling pretty glum and was about to pack up for the night when I suddenly thought, what the heck, let’s try for a quick capture of 21P! As it was fairly low to the East, I had to disconnect all the cables and carry the whole rig to the other side of the house and re-do Polar Alignment, PHD calibration and focus. I did think about not guiding, as I knew the exposures were going to be short, but it just feels wrong not to guide these days so I decided to do it anyway just for peace of mind if nothing else. So I started capturing around 04:15ish and as astro-dark was due to finish shortly after 5am I decided to just do 40 subs of 90s each using the IDAS-D1 filter (we have streetlights nearby). Went in to grab a quick 60 mins of shuteye, except I overslept and didn’t wake until 06:30, so was then in a mad rush to pack up and get ready for work! Which meant I forgot to get Flats, but thankfully I was able to re-use the master Flat from my M13 image from a few months back and it seemed to work just fine ? Processing this one was interesting to say the least. This is my first comet, so I had to do some research beforehand. These days I always do my stacking in APP, but I had to go old-school and use DSS for this one due it’s special Comet-only stacking mode. So I did 2 stacks, a regular Median one just for the stars, and a 2nd Kappa-Sigma one aligned on the Comet (and using the same reference frame as the Median stack). Some subs were badly affected by intermittent clouds, so I could only stack 33 out of the 40 subs (and tbh 33 was really pushing it, quality-wise). I processed each one separately in PS and then layered in just the comet on top using the ‘Screen’ blending mode. I actually wasn’t aware there was red nebulosity in the background until I started stretching, and it certainly would have been easier to process had it not been there, lol. As expected, I have had to use quite a bit of NR compared to my normal amount, due to the pitiful amount of exposure to work with. Hopefully it doesn’t look too bad but let me know if you think it needs more or less of anything in particular. Of course, there’s only so far you can ever go with just 49 mins of data at hand. As the capture was done in such a rush, I didn’t bother worrying about the framing. I just input the co-ordinates into SGP and let it centre on the object for me. But having now worked out where in the sky this is, and looking at the FoV, I can see that had I rotated the camera 90 degrees then the Cone Nebula would have been in the frame. I actually haven’t imaged the Cone before, so I think this winter I will make a point of imaging it in it’s own right, and then I can re-use it to make a much more interesting version of this image with a much better background. Fun times! C&C welcome as always. And thanks for looking! ? Edit: Decided to make a few changes, so here's v2:
Had some nice clear skies last weekend, so I simply had to take advantage of them, even though the temps dropped to -4 on the Saturday night! Thankfully i was able to just move the car a few metres and use the frost-free ground underneath to set up. And boy, what a god send Team Viewer is! I Once i was all set up, i was able to monitor it all from inside the house. Most of the neighbour's had selfishly decided to light fires, how inconsiderate of them, lol. It was quite annoying though i have to say, seeing all the smoke at times billowing across my FOV! Thankfully i stayed up late though, so i outlasted most of them It was easily the most productive 2 nights I've had so far. The skies were completely clear all night long on both nights. In the end i managed 11 hrs worth of exposure in total over the 2 nights. I still need to process the Soul Nebula subs (Ha and OIII), hope to get to that later this week, but for now here's the other object i was shooting, good old M45. So this is 2 hrs 40 mins (16 x 600s) using the Nikon D5300a and an IDAS-D1 filter. 30 Flats, 50 Bias, with aggressive dithering. Captured with Sequence Generator Pro, stacked in Astro Pixel Processor, and processed in Photoshop. I may have gone too far with the processing (i tend to do that), what do you guys think? I had an earlier version which was sooooo much smoother, but it was seriously lacking in visible nebulosity, so i kept going! Plus, i wanted to try and eek out some of the surrounding dust, which i just managed to get. I might end up reducing it by 50% in size, due to the noise, haven't decided yet though. C&C welcome as always of course! The last RGB image i did was a brief go at M42 about a year ago, and that was also taken from home using the same filter. I had forgotten just how hard RGB processing is when not captured from a dark sky! ps - I've also added a version below with some funky diffraction spikes. Just for fun of course! Although i actually don't mind them
Hello everyone, I recently bought this coma corrector for my Skywatcher Quattro 10S F4 , 1000mm primary for imaging with my unmodified canon 77D (APS-C sensor ) . Unfortunately I couldn't test it till now and I still have two days return guaranty. I read in one article that it's made for full-frame sensors , but there is no tests at all with APS C sensor, could someone (who has this CC and tested it on such sensor ) tell me if it would "cut off" a lot of FOV? Or it may face focusing (or any other) problems? also I want to ask if anyone tried it with light pollution filter, specifically the Hutech IDAS LPS D1, D2 or P2? My question here is: could I attach a 2" or 58mm filter on the telescope side of CC (or between the camera and CC) without facing focus problems? I know there is a Clipfilter for EOS cams, which will fit just inside the cam, but then I can't use it with EF-S lenses. Best regards
Hi guys I thought the DSO season was well and truly over for me, but the weather's been unusually clear here in N.I for the last while that i just couldn't help myself ? So even though there is no astro dark at this time of year up here at 54 degrees N, i decided i wouldn't let that stop me try for one last target. There was also a very big bright moon up as well, so i figured M13 was pretty much the only viable target for me. Of course, with just a wee SW 80ED to work with (at 510mm FL) i knew i didn't really have the FL to do this one justice, but having never shot a Globular Cluster before i was still excited to give it a go. So here it is: Shot on May 24 from Crumlin, N.Ireland 20 * 420s with the IDAS-D1 at ISO 200 10 * 60s with the IDAS-D1 at ISO 200 All frames dithered aggressively every frame Usual gear, Nikon D5300 on a HEQ5-Pro, guided with a QHY5 and PHD2, and captured with SGP. AstroPixelProcessor used for stacking, gradient reduction, and star colour calibration. Everything else done in Photoshop. The 60s subs were used just for the core. I'm kind of pleased with how it came out. Although i'm not completely sure tbh, as this is new ground for me, and if there's one area the wee 80ED does struggle a tad with it's with stars, and with a globular there's certainly nowhere to hide on that front! Also attached is a 100% crop showing just the globular cluster itself. C&C most welcome as always. Cheers guys!
WARNING!!! The following post contains an entirely under-whelming image! With nothing but clouds here for what has seemed like forever, and no sign of any new data in sight, i decided to turn my attention to some test data i shot back in August of last year. The reason for choosing this, is that i wanted to see how far my processing skills had come along, and i knew this one would be a serious challenge, as i had basically everything working against me. I shot this near the end of August while testing out the new imaging laptop and rowan belt mod for the HEQ5 Pro (which i had installed the previous winter, but hadn't had a chance to properly test). At the time, we were living very near the City Centre, and only had a tiny back yard, so the only target available was the Pac-Man nebula. This is also before i had the D5300 modified for better Ha response. I did however use my IDAS-D1 filter, which enabled me to shoot 8 min subs. So here's a full rundown: 9 x 8 min subs (only 72 mins in Total) ISO 200 50 Bias and 30 Flats Stock Nikon D5300 with an IDAS-D1 filter Skies were SQM 18.7 (Bortle 6) AstroPixel Processor was used to stack (with x2 Drizzle), do an initial stretch, and then perform gradient reduction. Everything else was done in Photoshop. I've shown my previous (hideous!) attempt below as well, which was stacked in DSS and also processed in Photoshop. I should say, i don't think APP played too much of a factor in the improvements, it was mostly just down to better Photoshop skills. I know i didn't really need to drizzle, i just wanted the nebula to look a bit bigger, so went with the drizzle and then just trimmed the fat off the edges. Overall i was pleasantly surprised what came out at the end, given this was not much data, done with an unmodified camera in heavy LP. Anyways, just thought i'd share, to kill the boredom!
Hey guys We had a couple of clear night over the weekend (finally!) so i decided to put the man-flu to one side and get back to imaging. I mostly went for the Rosette Nebula (still a WIP for now) but once it passed behind the neighbour's house i was starved of any other Ha targets. The big, bright moon was well up at this stage, but the skies were crystal clear so it seemed like such a waste not to use them. So, i decided to go for M81 & M82, seeing as they were well positioned, and just hoped that shooting galaxies under a bright moon wouldn't be anywhere near as bad as shooting nebulae in RGB under the same conditions. Due to the lateness of the night, and my own health limitations, all i could manage was 140 mins of Ha on the 1st night, and 90 mins of RGB on the 2nd night. I made a boo-boo on night 2, and captured at ISO 800 instead of 200, which resulted in most of the stars being blown-out (i really, really hate how SGP is obsessed with ISO 800. why won't it let me set a default?!). The Ha data wasn't really of much use if i'm being honest. The OSC data picked up the Ha portions of M81 just fine, so it was just the jets in M82 where it only really added something, although i do think it was worth it in the end. Here's the capture details: 9x 600s RGB (2" IDAS-D1) 7 x 1200s Ha (2" 7nm Baader) 30 Flats, 50 Bias, dithered aggressively every frame Stacked in APP, Processed in PS (i used the Ha data for the Red channel in the RGB image). SW80ED, HEQ5-Pro. It's obviously light on exposure, i would ideally have liked at least 3 hrs of RGB, but beggars can't be choosers i suppose, so i'm calling this one done and moving on I haven't done much RGB or galaxy imaging, so C&C welcome as always guys.