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Found 8 results

  1. 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

  2. Seasons greetings, all! HiloDon and I are at it again with another seasonal delight for our friends here at SGL! HiloDon provided the stellar images and I created the musical landscape and produced the video. There's a little surprise near the end! Hope you enjoy! For all who observe, have a Merry Christmas and Happy New Year! Reggie
  3. Hello everyone, Last wednesday, I tried my first shot with an Astrotrac, which I borrowed from a friend before making the jump and buy one. And I must say that I'm quite amazed by its tracking capabilities, even without an autoguider. I know that the lens I used has only 85mm of focal length, but I only got a 5 pixels drift during 45 minutes of imaging : that's quite impressive Enough chitchat, here are the images : 5DmkII, Astrotrac, 85mm f/4.0, ISO 800, 14 x 60 seconds exposures, 15 darks, 50 bias, no flats, PixInsight for everything except the colors/saturation. From the Southern Cross to Eta Carina 5DmkII, Astrotrac, 85mm f/2.8, ISO 800, 9 x 60 seconds exposures, 15 darks, 50 bias, no flats, PixInsight for everything except the colors/saturation. Pipe, Trifid and Lagon nebulas, with some Barnard 5DmkII, Astrotrac, 85mm f/2.8, ISO 800, 30 x 60 seconds exposures, 15 darks, 50 bias, no flats, PixInsight for everything except the colors/saturation. Rho Ophiuchi A mosaic of the last two images Click on the pictures for a larger version I hope you liked them ! And if you're on the fence to buy an Astrotrac, just do it, it's an excellent piece of gear. Clear Skies
  4. So the Johnson got a bit repetitive, but I learned how to bring things to "life" from the night sky. I saw where the Trifid looked venerable to my wondering telescope. I got on it, but it was wandering through our Southern Palm tree. I decided to let things run anyway, taking 150 second images with the G3 camera in YCbCr color mode. It began centered, but I imagine the disruption of the tree caused PHD2 confusion. I threw away the first 22 images from a 50 image sequence run. I was happy to see these the next morning. The AVX with PHD2 guiding, or Stellarium, just continues tracking the guide star until it parks itself at limits of the mount, often aimed downward (good if dew happens, or bird nests). I get up at dawn anyway and go set the mount to 'Home' (Polaris) while the coffee maker is warming up, and bring in the Borg-A-Scope. The nights images are on the extract-able 64 Gb SanDisc memory card in the Stick computer. I get my coffee, mount the micro card in it's carrier, and browse the dreams it gathered. Then do my workflow to convert them to JPG's for working in Photoshop Elements 12 where I filter the noise (which turns the 'rainbow Sprinkles' into stars, while retaining the colors the camera gathered). Then run a batch conversion I've tuned into a minimal transition, and the JPG's are ready to upload into gifmaker.me. And that works the magic to bring the individual images into a sort of time-lapse, usually at 50 milliseconds per image. I find it fun. And it isn't wearing out my DSLR, and gives motion to a deep space object. I'm hoping for an interesting summer of Nebula chasing. Simple mind - simple pleasures. I'll be back tonight for some other victims of the Borg-A-Scope. Below is my aiming shot. The tree is the discoloration.
  5. 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
  6. 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 )
  7. 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.
  8. 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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