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Found 8 results

  1. ....last night I shot an elephant in my pyjamas....how he got in my pyjamas I'll never know .....hahaha - the old Groucho Marx ones are the best Here's my first narrow band image - be brutal - I won't improve if you aren't :-) ASI1600MM; 12x5min; Ha,Oiii,Sii; Flats/Darks; Processed in PixInsight The colour image is R=Ha G=Oiii and B=Oiii (I didn't use the Sii in G as when I did it turned some elements purple!?) I'm really happy with the Ha one but I was expecting greens and blues (Hubble Pallet?) when I combined the 3 together - as above - when I did I just got purple - more reading to do no doubt :-) David
  2. Ole Alexander ("Xplode") just published a very nice Ha image of the Elephant Trunk on Astrobin (from his magic mono modded Canon 6D and TS 12" imaging Newtonean, 8x600" ISO1600 ) and he has let me use it to add more Ha detail in my recent DSLR image of the same object (Canon 60Da, ES 5" Apo refractor, 18x600" ISO1600). Here is the result. For some reason this object looks quite different depending on how you orient it. All comments welcome, including the preferred orientation of the trunk.
  3. Had my first go at this target in narrowband with the QHY5L-II-M. Was very skeptical if i could use the extremely faint and noisy OIII data at all, but i think it did somehow work, although it's a bit on the noisy side. all in all i'm very happy with the result, especially for my first attempt. Not sure if i made the proper color balance though? Any tips and thoughts are welcome. Captured with the QHY5L-II-M at 50% gain, unguided with a 135mm F/3.5 Olympus lens. 100x 120sec OIII 47x 120sec Ha
  4. Hi Fellow Gazers! I’ll cut straight to the chase. This is: 7 x 600s Ha 15 x 900s OIII Total Exposure time 4 Hrs 55 mins 2” Baader filters. 30 Flats and 50 Bias. No Darks. Dithered every frame. Nikon D5300 (modded by JTW Astronomy) Skywatcher 80ED Skywatcher HEQ5 Pro Mount (with Rowan Belt Mod) Guided using an absolutely ancient QHY5 through PHD2 (using the new PPEC algorithm, which I found did lower my RMS slightly) Captured with SGPro Pre-Processed in APP Post-Processed in PS This wasn’t actually meant to be a full process tbh. I just started quickly playing with the data, and once the classic Hubble golden hues started to appear I was addicted and just couldn’t stop! Lol. So I didn’t even bother doing any gradient reduction on the Ha and OIII stacks. I used one of Annie’s Astro Actions (Hubble Palette Creation) to build the image. Obviously this requires an SII image, so for that I just layered the OIII over the Ha and blended at 80% opacity (so 20% Ha and 80% OIII) to create a synthetic SII. Does anyone know if it’s better to use the ‘Channel Mixer’ option instead for this? I then used Bob Franke’s excellent colour-mapping tutorial to bring out the classic Hubble Palette colours. Once I was happy with the colours I then added back in the Ha-only image as Luminance, and blurred the colour layer to remove the noise. Adding the Ha back in as Luminance made a huge difference to the noise and really reduced the truly massive stars from the OIII image (which had to be stretched aggressively). Then the usual final tweaks, star reduction, minor levels & curves, a hint of further noise reduction, etc The OIII subs showed virtually nothing on screen, even with SGP’s auto-stretch set to High. The moon was also a major factor over the 2 nights, it was in the region of about 85% - 95% illuminated! (the OIII subs did have a noticeable gradient as a result) .I probably shouldn’t have bothered with the OIII in fairness and just concentrated on getting Ha, but I hadn’t actually used the OIII filter since I bought it so I just couldn’t resist! I need to capture a LOT more Ha for this though, hopefully I can add to it soon. When I do a re-process (hopefully soon) I will make the following corrections: 1. Remember to add in the last 2 OIII subs (total 30 mins) that I somehow missed out on this version (doh!) 2. Use a better blend for creating the synthetic SII. The OIII image is so much noisier than the Ha one, so it probably makes more sense to use a higher percentage of Ha than OIII, probably something like 60% Ha and 40% OIII. 3. I actually have another 5 600s Ha subs that I omitted due to them being affected by thin high-level clouds. I did a stack using all 12 subs, and I was amazed at how good it still looked (APP’s ‘Quality’ setting seems to work really well at weighting the subs accordingly). So I think next time I will use all 12 Ha subs as it should lead to significantly lower noise (which is excessive at the moment). 4. Do gradient reduction on the Ha and OIII stacks. Narrowband imaging is all a bit new to me so C&C, and any tips, will be most welcome. Clear skies folks! https://flic.kr/p/Dbtyvj
  5. Three pane mosaic acquired last weekend (August 30 - 31, 2013) at a dark site in Northern France (Talma, Grandpré, Champagne-Ardenne) with an Epsilon-180ED f/2.8 and Canon EOS 5D Mark II DSLR. First light image with this configuration. Just ~1 hour exposure time per pane (clouds and haze prevented acquiring more data). Please visit my website to view the technical details and to explore the mosaic at 6000 x 4000 pixels. Thanks for looking.
  6. vdB 142 / IC 1396 The Elephants Trunk Nebula in Cepheus, some two & a half thousand light years from Earth. For my last (& infrequent) AP post of the year, a shot of "The stuff Stars are made of".. A close in on one of my favourite targets, a beautiful area of gas & dust creating a stellar nursery, a Celestial Fireworks show to see out the old year. Imaged over several nights from 29th November - 17th December, I collected as much usable (I threw a fair few away) data as our temperamental skies would allow. I ended up with over 12 hours in total of Red, Green, Blue & Ha filters to create this HaRGB image. I'm still hoping to get enough Lum on this for an LRGB but with it becoming an early evening target disappearing into the murk & behind the hoose, I'm not holding my breath this season. I've pushed the saturation a wee bit as I'm not one for the "Salmon Pink" it so desperately wants to be! RC8 & Atik 314L+ with AP 0.67 reducer 25 x 300 R 25 x 300 G 27 x 300 B 23 x 900 Ha (astrodon 5nm)
  7. Hey guys I shot my 1st full Bi-Colour NB image back in October/November of 2017. It was the Elephant Trunk Nebula, and at the time i remember having a hard time processing it to my own satisfaction. Fast-forward 5 months and, well the weather is bloomin awful, lol, and the nights are now short, so i thought i would re-visit this in the hope i could do better now that i have a bit more PP experience under the belt. The main differences this time (apart from rotating the image to frame it differently) are, RGB combination was done in APP rather than PS. The OIII signal was also given an x2 multiplier to help boost it (this meant i didn't have to give it a big manual stretch in PS). No HLVG has been done at all this time, as i now prefer to leave the Green in, as i think it adds more depth to an image, as long as it's not excessive. This has made a big difference i feel, as from memory i think i really went to town on removing the Green in the original version, and subsequently everything came out brown as a result. I also went with a smaller stretch overall compared to last time, although i did up the Vibrance quite a bit in the new version (i couldn't help myself). Overall though, compared to the original the new version has had a LOT less processing done to it. Whether that shows (or even helps) i'm not completely sure. Still not 100% sure it's the best version of itself it can be, but overall i am much happier with the result. I actually didn't do any sharpening at all in this one, so i could possibly do something there. C&C most welcome please. Have i gone overboard on anything? I had a hard time getting the overall brightness to a level i was happy with. When i thought i had it right, i looked at it the next day at work and on my phone and it looked way too dark, so i ended up cranking it up several notches as a result. 7 x 600s and 14 x 900s of Ha 17 x 900s of OIII (just shy of 9 hrs in total). 50 Bias and 30 Flats Combined as SHO. The SII was synthesized from a blend of 30% Ha and 70% OIII. Taken with the usual gear: Nikon D5300a and SW 80ED scope on a HEQ5 Pro mount. Captured with SGPro, pre-processed with APP and post-processed with PS. Here's a link to the original thread: And the latest version:
  8. Like most fortunate enough to be able to image through the clear nights of the past week I captured some of the best data of my time in this hobby. I focussed on IC 1396 and the Elephant Trunk nebula imaging it in both narrow band and LRGB I posted my first effort on this object after an hour of data in each channel of Ha, Oiii and Sii. This final process contains 2 hours in each channel / bias-flat-darks / processed in PixInsight with no tools used except HistogramTransformation, CurvesTransformation and SCNR...no noise reduction. I'm going to process a bi-colour example then move on to the data I captured on the Wizard Nebula :-) These are very low resolution screenshots - full resolution can be seen on my website. David
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