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From the album: Deep Sky Imaging
The Trifid nebula, aka M20 or NGC 6514, a popular and bright nebula about 4300 light years away in the constellation Sagittarius. This image was taken through my Celestron 8" SCT on the CGEM at f6.3 using a cooled and astro-modded DSLR. Exposures: RGB subs: 6x60s, 5x120s, 5x180s, 5x240s, 4x300s HII subs: 10x600s OIII subs: 9x600s Total Time: 04hr 21min. Most of this image is natural color because I only used 10% of the HII and OIII stack to emphesize the detail in the red and blue hues.© Mariusz Goralski
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From the album: Alt-Az / NoEQ DSO challenge
The Trifid Nebula (M20) First attempt at it, trying to take advantage of my last days on a very dark site; Unfortunately failed to counteract too much wind, so it totaly lacks precision. Gear: Olympus E-PL6 with Skywatcher 130PDS 632mm/4.86 and SWCC at f/4.5 on Celestron Nexstar SLT tracking Alt-Az. Capture: 9 lights (/ 14% keep) x 30s x 3200iso, 23 darks Processing: Regim 3.4, Fotoxx 12.01+ Site: deep country 26km from Limoges, France Sky: good seing, SQM=21.4© Fabien COUTANT
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From the album: Wide-field (not barn-door)
M8 "Laguna" nebula, M20 "Trifid" nebula, Small Sagittarius Cloud (star patch), M17 "Omega" nebula and M16 "Eagle" nebula, and a few others. Capture: 10 lights x 15s x 1250iso, 5 darks, Olympus E-PM1 with Helios "44M-6" 58mm/2 at 2.8 on Omegon EQ-300 tracking RA, neodymium filter. Date: 2016-07-24 Place: near country 50km from Paris, France© Fabien COUTANT
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From the album: Deep Sky Imaging
Trifid nebula, aka M20 or NGC 6514 is a popular and bright nebula about 4300 light years away in the constellation Sagittarius. As well as being a test image to determine whether the "Hypertune" has given me any improvement, this image was an experiment I was planning to do for a while, but never got around to doing until now. I always wondered if narrowband filters could be used to create a natural color looking image by using H-alpha as red, OIII as green and Hydrogen Beta as blue... logically these wavelengths would closely correspond to the visible Red, Green and Blue, so it made sense that it would be so. I looked up this idea on a few forums and, even though it was mentioned, imagers were advising against it claiming that H-beta is the same as H-alpha except at half brightness... and I have not found any images with this kind of color channel combination. The statement that Ha and Hb are essentially the same data didn't make sense to me simply because the Hb signal is in the blue part of the spectrum as opposed to Ha being in the deep Red, so I thought that surely this will translate to different signal in each of the channels. I did a test exposure and Hbeta was indeed lower brightness but to me there was substantial amount of difference between the two filters, even when I matched the image brightness levels... enough difference for me to try imaging with both narrowband filters as seperate red and blue channels. So seeing this difference between channels, I decided to do a full imaging session spending time to image through all 4 filters, SII, Ha, OIII and Hb, and use all but SII for this particular image below with the aim to use 7nm narrowband filters to create a natural color looking image, combining the narrowband channels in the order Ha, OIII & Hb as RGB. I like the result, as I think that it's convincing of true color and I think that the benefit of using narrowband to create natural/true color images in this way is that light pollution will not limit sub lengths any more and fainter matter can be picked up from more light polluted skies. Imaged through an 8" SCT at f6.3 using a QHY268M camera, for a total exposure time of 9 hours and 5 minutes.© Mariusz Goralski
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From the album: HEQ5/SW 80ED
I started with these objects almost a year ago. Experience and more equipment make quite a difference. -
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Updated: new processed version ( no new data ) - 9th July ( please click / tap on image to see larger / sharper ) Still needs work but I do quite like the way the dark clouds are showing up against the bright nebula and I think the star colour is fairly close to accurate ( albeit that the saturation is too high ). ......... Just a work-in-progress version ... This is a central crop ( around 1/3 width ) of the original image and I am still trying to find the best way to process it ( this one has way too many problems; not least of which is the overblown stars and weird highlight artefacts on a few of the stars...). I have processed 12 stop HDR images before successfully but this one is proving very challenging. Anyway, I am sharing it now because the best results I have had so far involve stretching an extracted intensity image and then applying this to the RGB image to effectively stretch the colour image without any colour shifts and I was suprised that it produced this highly saturated image. That is, the image below has not had any manual adjustment to the saturation or any tweaks to colour balance. Summary of workflow: - Calibration ( master bias/flats, no darks ) - de-bayer - alignment then per set of images ( 12 sets in total from 1/8sec to 240 sec all at ISO800 - around 10 each for short exposures and 26 of the 240s long subs) - integration - DBE to obtain the background ( throw away the corrected image - just keep the background ) - Pixelmath to find the minimum of the background image and use this to produce an average Light Pollution image - Subtract the LP from the integrated image - HDRCompostion of the 12 integrated LP corrected images to create masks - throw away HDR image ( not usable for some reason - terrible colour shifts ) - Pixelmath to combine images with masks to produce an HDR image ( 64bit) with around 32bits of dynamic range - Extract CIE-L as new layer - Multiple interations of Maskedstretch of CIE-L image to produce a fully stretched image -Pixelmath to scale RGB image using CIE-L inage level information - some level tweaks ( curves and histogram ) mmm, still not happy - I need to keep experimenting ... Anyway, as I said, I am very suprised that the workflow produced such a saturated image with ( I think ) quite good colour balance. Equally I was suprised to see such a range of star colours from deep orange through gold to white and blue - all without having to spend ages tweaking colour balance as I usually have to . ( note: camera is an unmodified DSLR ( Nikon D5300 ) so HA regions are not so red )
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Re-processed 12th August 2017 using the new PhotometricColorCalibration tool from Pixinsight. This function seeks to adjust the colour balance of the image by plate solving the image and comparing the colour of the stars in the image with the colour values for these stars as stored in various databases. ( please click / tap on image to see larger / sharper ) ................. Trifid Nebula ( M20, NGC 6514 ) I manged to capture another 60 odd 240sec images in late July to add to the data I captured at the end of June ( Trifid Nebula WIP ) Trifid Nebula in Sagittarius ( Messier 20, NGC 6514 ) ( please click / tap on image to see larger and sharper )' and a crop of the main part of the nebula ... I am quite pleased with how the colour balance turned out - especially the colours of the stars ( my goal has been to get the colours of the stars as close as I can to how they would look with "daylight" whitebalance and no light pollution / sky glow). ----------- "High Dynamic Range" ( HDR ) image of the Trifid Nebula - built from exposures ranging from 1/8 to 240 seconds in duration. Image details: from nova.astrometry.net: Size: 52.2 x 35.5 arcmins. Centre: 18h 2 min 30.8 sec, -22deg 57' 37.7''. Orientation: up is -88.2 East of North ( ie. E^ N> ). Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ). Corrector: ASA 2" Coma Corrector Quattro 1.175x. Effective Focal Length / Aperture : 1410mm f4.7. Mount: Skywatcher AZ Eq6 GT. Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2 . Camera: Nikon D5300 (unmodified) (sensor 23.5 x 15.6mm, 6016x4016 3.9um pixels). Location: Blue Mountains, Australia Moderate light pollution ( pale green zone on darksitefinder.com map ). Capture: 12 sets of sub-images with exposure duration for each set doubling ( 1/8s to 240s ) all at ISO800. Processing: Calibration: master bias, master flat and no darks. Integration in 12 sets. 105 x 240sec main image. 5 each for exposures 1/8 to 120sec - to caputure highlights. HDR combination using Pixinsight's PixelMath function.- 26 replies
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Hello all, Sharing with you my quickie exposure... The Trifid nebula, aka M20 or NGC 6514, a popular and bright nebula about 4300 light years away in the constellation Sagittarius. I had no plans for another object after imaging the "War and Peace" nebula and I didn't want to waste a clear night, so I pointed the scope at M20 and started exposing. This image was taken through my Celestron 8" SCT on the CGEM at f6.3 using a cooled and astro-modded DSLR. Exposures: RGB subs: 6x60s, 5x120s, 5x180s, 5x240s, 4x300s HII subs: 10x600s OIII subs: 9x600s Total Time: 04hr 21min. Most of this image is natural color because I only used 10% of the HII and OIII stack to emphesize the detail in the red and blue hues. Clear Skies, MG
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Finally managed to finish processing this one, taken in the summer: 19 subs at ISO1600 - a combination of 5min, 4min and 3 min (the first ones were too bright, maybe I should try a lower ISO), darks, flats and bias, equipment as per sig. The Trifid Nebula (M20) is an H II region located in Sagittarius. Its name means 'divided into three lobes'. The object is an unusual combination of an open cluster of stars; an emission nebula (the red portion), a reflection nebula (the blue portion) and a dark nebula (the apparent 'gaps' within the emission nebula that cause the trifurcated appearance). The Trifid Nebula is a star-forming region in the Scutum spiral arm of the Milky Way. The most massive star that has formed in this region is HD 164492A, an O7.5III star with a mass more than 20 times the mass of the Sun. This star is surrounded by a cluster of approximately 3100 young stars. It is approximately 5000 ly away from Earth. Its apparent magnitude is 6.3.
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Took ths Trifid Nebula photo on the 16/7/2015. Photo Details: Luminance: 4x5Min Total:20Min RGB: 4x5Min for each RGB Channel. Total RGB: 60Min Total Exposure: 1:20 Min Telescope: SkyWatcher P250 10'' F/4.8 Camera: QSI583 Mount: ASA DDM60 Filters: Astrodon LRGB GenII No Guiding! http://www.flickr.com/photos/101543943@N04/19373322294/in/dateposted/ Enjoy Haim Huli
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Hello All, It's been a while since I posted any images because I was upgrading & replacing faulty cables and cleaning up my observatory as well as Hypertuning my CGEM, doing this between family commitments so it has taken me about 2 months to complete it all. The first object that I imaged using the Hypertuned mount was the Trifid nebula. Trifid nebula, aka M20 or NGC 6514 is a popular and bright nebula about 4300 light years away in the constellation Sagittarius. As well as being a test image to determine whether the "Hypertune" has given me any improvement, this image was an experiment I was planning to do for a while, but never got around to doing until now. (I'll write about my adventures and Hypertuning results in another post for anyone interested.) I always wondered if narrowband filters could be used to create a natural color looking image by using H-alpha as red, OIII as green and Hydrogen Beta as blue... logically these wavelengths would closely correspond to the visible Red, Green and Blue, so it made sense that it would be so. I looked up this idea on a few forums and, even though it was mentioned, imagers were advising against it claiming that H-beta is the same as H-alpha except at half brightness... and I have not found any images with this kind of color channel combination. The statement that Ha and Hb are essentially the same data didn't make sense to me simply because the Hb signal is in the blue part of the spectrum as opposed to Ha being in the deep Red, so I thought that surely this will translate to different signal in each of the channels. I did a test exposure and Hbeta was indeed lower brightness but to me there was substantial amount of difference between the two filters, even when I matched the image brightness levels... enough difference for me to try imaging with both narrowband filters as seperate red and blue channels. So seeing this difference between channels, I decided to do a full imaging session spending time to image through all 4 filters, SII, Ha, OIII and Hb, and use all but SII for this particular image below with the aim to use 7nm narrowband filters to create a natural color looking image, combining the narrowband channels in the order Ha, OIII & Hb as RGB. I like the result, as I think that it's convincing of true color and I think that the benefit of using narrowband to create natural/true color images in this way is that light pollution will not limit sub lengths any more and fainter matter can be picked up from more light polluted skies. What do you think? Imaged through an 8" SCT at f6.3 using a QHY268M camera, for a total exposure time of 9 hours and 5 minutes. CS, MG
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Impossible to get this from home so resorted to some DSW data taken recently. This is a widefield Ha of the Trifid, Lagoon, M21 and NGC 6559.....22x 300secs QSI 583, Rokinon 135mm f/2 at Rowe New Mexico. Stacked in DSS and processed in PI and PS CC.
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Took a chance on the skies staying clear last night and went deep on M20 The Trifid nebula. I battled pretty much with everything. bad collimation, gunfire and or big firecrackers (LOL), Windows 10 acting up, bad batteries, uneven guiding and imaging from turbulent skies, trees, some pesky dew, even peskier bats... All in all a really fun night!This is what I ended up with finally around 2 a. m. using my unmodded Canon and the C8. 15 300 second lights, 20 darks 40 flats in DSS then onto PS for levels and curves and a final tweek in LR. Let me know what you think of the processing.
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The well known Triffid Nebula - M20. I took Luminance data using my GSO RC10 (reduced to f/5.6) & QSI683L. Unfortunately I didn't have time to capture color but I had these color data since 2011. When I shot this target using my old WO FLT98 and my lovely ATIK314L camera. Well this is why the target cropped at rectangular shape. Hope you like it Camera: Lum: QSI 683L, Color ATIK314L Telescopes: GSO RC10 Reduced to f/5.6 (Lum) WO FLT98 (Color) Mount: Astrophysics Mach 1 GTO + Skywatcher HEQ5 Filters: LRGB Location:Mt Parnon, Greece @ 1430m Full resolution: http://www.celestialpixels.com/Nebulae/i-85LQxdP/X2
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Hi all, This is my first post in this forum. I just received a HyperStar for my C14. Weather has natrually not cooperated, but I did manage to get out to take these shots last week. 80 x 20 second subs using a modified Canon T2i 16 flats 16 darks 16 dark flats 16 bias Stacked with ImagesPlus and final tweaking in Photoshop. I still need to work on the collimation for the Hyperstar. I also need to get my polar alignment nailed down so I can increase the exposure times. So far, I really like this f2 imaging! Hope you enjoy the photos. As always, comments and criticisms welcomed. Cheers Tim
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Evening SGL, though i would share my first astro mosaic. Taking on this little project was a spur of the moment decision, i made no plans for it until i imaged M8+M20 and thought "hmmmm, a galactic centre mosaic would look pretty tasty!". I then planned to create a 3x5 mosaic of the area totaling in 15 panels. But like i said, without planning it out properly i was left with the Milky Way dropping too low in my sky for me to get anywhere near what i wanted. So i only managed 4 panels... Each panel was around 70-80 minutes exposure time except one which i lost a lot of frames on because of cloud, leaving me with one panel of which the exposure time totaled 45 minutes. The processing and creating a seamless image was hard but this 'dud' panel caused more problems. I had to stretch it first and then bring the rest up to the same levels, if i had managed 70 minutes on this panel, i could of stretched the whole image a bit more without any problems. Each panel was made up of 120 second exposures at f3.2, ISO 800. And here is a couple of the single images... M8+M20, the Lagoon and Trifid And a part of the Pipe nebula, i call this area Barnard City I will be better prepared next year and will hopefully get to finish what i've started! All images were taken with a Canon 1100D and a EF200L on a Astrotrac TT320X-AG Clear skies!
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I would dearly love to be able to get a decent image of this target. As DSO's go it pretty much has it all, reflection, emission, dark nebulosity.... But it is very low from the middle of the UK, and though I raised my pier by 12" the other week, you can see how close it sits to my roof top, as the roof top is in the corner of the image. Even so I am pleased with what the Atik 460ex OSC managed to do in the circumstances, and in only 25 minutes too Cheers Tim
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Last Saturday, decided to try this very beautiful object. Here it is quite low (max 23 degrees altitude) and this caused a lot of problems for the guiding. The guiding star was dancing in PHD and forcing it to make a lot of false corrections. As a result half of the images are unusable When the object closed the meridian switched to Cocoon nebula, where PHD was much more happy and spent the rest of the dark time there So here is my modest image of M20... - 33min total (4x7min, 1x5min, ISO 1600, no darks, dithering) - MN 190, 550D (modified), EM-200 - PHD, APT, DSS, PS
