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Found 9 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. Finally managed to add some proper Ha to the previous version (which was a noisy mess of a thing!), so this is now: 7 x 600s and 14 x 900s (4 hrs 40 mins) of Ha 17 x 900s (4 hrs 15 mins) of OIII SII synthesized using a blend of 60% of Ha and 40% of OIII Nikon D5300a 2" Baader filters Skywatcher 80ED Skywatcher HEQ5 Pro 50 Bias and 30 Flats Guided with PHD2 and a finder-guider (QHY5) Captured with SGP Pre-processed in APP Post-processed in PS The extra Ha data has made a massive difference. So this one was much easier to process. Still not completely happy with the colours, I may tweak them a bit at a later date. But for now I think I'm pretty much done with this target, time to move on to a new one methinks! C&C welcome as always. Clear skies! https://flic.kr/p/GBb38M
  3. I shot this over 6 nights. We had an amazing go of clear nights in a row. Now it's all rain until next week. But while it was clear, I managed two nights per filter on my newest scope. A total of ~ 760 3 min images. I think the total imaging time was 37.8 hours. Shot it through my newest scope the RedCat 51mm. It did well, but could have used a belt focuser. I managed to get one together from Moonlite, but only just after imaging this. The scope was able to hold focus a good bit of the night, but the quality curve looked like a swan dive towards the end as the scope lost focus at the end of the night each night. I got out my old trusty AVX to manage the aiming parts of the setup. Guided by an old Orion SSAG I had lying around and a recently acquired ZWO Mini guide scope since it matches the RedCat so well. But I think I'm going to need to swap out the guide cam for something with smaller pixels. Overall though, it worked. Main camera was ZWO ASI 1600 MMC. I used 5nm Astrodon filters.
  4. Dec

    Elephant Trunk Nebula.jpg

    From the album: Dec

    An attempt at combining Ha, Oiii and Sii with false colour
  5. 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
  6. From last night, heres a pic, the elephant trunk nebula, in h-alpha through the MN190, using an atik 314L plus mono. images were 20 x 6 mins. Thanks for looking..........
  7. Having waited patiently for the first sign of a nebula being visible from my back garden and coupled with the fact that I have recently acquired an Ha filter. I decided last week was the first real opportunity to attempt imaging my first narrowband image. Now I know this is way too early to be imaging Nebula so this was simply a test to get to grips with focusing, post processing NB images and other technical gremlins. Happy with the outcome even though it is woefully short on exposures meaning it’s a bit noisy. The 3nm Chroma Ha filter seems to be performing well especially as the Elephant Trunk nebula is at a painfully low elevation of 26 degrees and pointing straight through the light dome created by London. It has however at least given me confidence that when the Nebulas come back in a few months’ time I should be able to have a good crack at them from my location. 5 x 600 Secs Flats, Darks and BIAS Processed in PixInsight
  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
  9. Sp@ce_d

    IC1396 Combined HaRGB

    From the album: Unfinished Business

    Thats all I'll get for this season.. 31 x 5Min Ha 314L+ & ZS66 62 2Min 1000D & 80ED Combined with Nebulosity, Registar & CS3
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