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Found 14 results

  1. TECHNICAL: R 20x480s | G 20x480s | B 20x480s | Artificial Flat Frame | ATIK414ex, Baader RGB filters, ASI120mm guiding though PHD2 | Meade LX90 8" SCT reduced to f/6.3 Recently moved to a small beach/hamlet near Looe in Cornwall, and despite a street lamp being 15m away from my imaging spot, the skies here are significantly dark than any where else I have lived, so thought I'd try them out with a galaxy broadband image. Needless to say, I am looking forward to more clear nights! I tried making flat frames via the dusk light method, and no matter how little or much exposure I gave the image, DSS made the edges glow and the image extra noisy, not sure what I am doing wrong, so used the artificial flat frame method, which works well enough, just a bit more time consuming. I haven't imaged galaxies regularly, indeed, this is my fourth attempt at such an object and I need more practice, I got more data, indeed got 30xchannel in the end, but somehow couldn't get back to this colour balance and detail, so kept the smaller data set version. Anyhow, thanks for looking, really do love galaxies!
  2. M63 galaxy,taken over several nights, in LRGB, through a skywatcher MN190, an atik 314 mono. Could have done with more images per stack, but though it was worth a share being its the first time ive tryed proper colour. Each colour was between 12-15 at 6 mins.......
  3. From the album: Deep Sky III

    First go with my Esprit 150 at M63. I particular like the galaxy colours and I was pleased to capture some of the surrounding nebulosity. The image is an LRGB and represents about 10 hours integration time. A corresponding image within my Deep Sky II album was taken with my ED 80. LIGHTS: L:11, R:19, G:15. B:17 x 600s, DARKS:30, FLATS:40, BIAS:100 all at -20C.
  4. alan4908


    From the album: Deep Sky II

    I went for a reasonably long exposure (15.5 hours) mainly since this length of time appears to get optimal results. The image is a Red blend of Ha using PS Screen Blending, I did try the Lighten blending method but preferred the result with Screen. The Luminescence (L) layer was deconvoluted in CCDstack and then further sharpened with Smartsharpen and a High Pass Filter. The RGB layer was blended into the L layer after a linear stretch with Levels. Shadows/Highlights was then applied to the RGB layer before the image was combined into an LRGB. LAB colour applied to a and b channels and finally a gentle boost of Vibrance. The starfield was processed separately since some of the stars where getting too big, I also spent quite a long time correcting the star field for Chromatic Aberration errors.
  5. I can't quite believe this but, having checked, the last image I posted was in 2014!! Anyway, I spent most of 2017 building my observatory (thread here) having moved house, so finally I have been able to start using it. This is also my first LRGB image, so combining that inexperience with at least 3 years of cobwebs made this a bit of a struggle to process. I haven't done anything special - just curves and a star mask in Photoshop. Any C&C welcome. No tidal streams here - I thought about trying to go a bit deeper, but decided to hold back on the ambition since it's been a while Maybe I'll return to it later in the season once the moon has gone away. It could also do with some more RGB data. M63 L: 27x600s RGB: 3x600s each Atik 460ex MN190 Thanks for looking!
  6. alan4908


    My latest attempt at the Sunflower galaxy (M63). I went for quite a long exposure (just over 15 hours) and was quite pleased with the result. As an aside: as my processing experience increases, I keep seeing more and more defects to process out..... I'm taking this as a good sign but it is leading me down to path of looking for an upgrade of my current scope..... on the other hand I am getting better at eliminating Chromatic Aberration from my starfields Alan LIGHTS: L:22, R:18, G:14, B:18 at 600s and Ha:7 at 1800s. DARKS: 30; FLATS:40; BIAS:100 all at -20C.
  7. This is my first attempt at imaging this object. This was made on March 25th 2015 from 57 x 30 second exposures at 6400 ISO along with 10 dark frames and eight flat frames. It's also the first experiment in using an AltAz mount on a homemade wedge for polar alignment in order to try and get some longer exposures.
  8. I didn't realise it was clear until I poked my head out of the window around 10pm. I then scrambled to astro-action stations and the scope was ready soon after 10:30pm. The sky was ok but nothing special and the horizons were a little misty but given slim pickings in recent times, there was no way I was going to waste this opportunity to view some more galaxies. I started with M63, a nice bright galaxy which is reasonably easy to find. I simply wanter to make sure I got my eye in before attempting anything more difficult. The more difficult galaxies were over towards the East of Canes Venatici, namely the magnitude 11 pair NGC 5353 and NGC 5354. These are close together and both have a high surface brightness. The former of the two was much easier to view, the dimmer companion took time to separate but gradually it was possible to see both as hazy stars. No other galaxies in this rich area were visible, including NGC 5350 which I did spend some time trying to get a hint of. Back in the centre of the constellation, I returned to NGC 4490, just beyond Chara. Another nearby galaxy was NGC 4618, condensed and just detectable. A rough continuation of that trajectory brought me to the far brighter M94. This had a very bright core and quite large almost circular halo surround. One of the best galaxies in the night sky. A little further West, I managed to glimpse the very long milky radiance of another galaxy NGC 4244 (Caldwell 26). Surprisingly harder to see was the only Coma Berenices galaxy of the night M98. This took nearly half an hour before I convinced myself that I had managed to see it. Five new galaxies after another long wait. Tomorrow night looks promising. Fingers crossed for another report of more galaxies tomorrow. ____________________________________________________________ Observing Session: Saturday / Sunday, 2nd / 3rd March 2013, 22:30 hrs to 00:40 hrs GMT VLM at Zenith: 5.1 New - Revisited - Failed
  9. From the album: Deep Sky II

    A reprocess of my previous attempt which is also in this gallery. The major difference is that I attempted to correct the starfield which was distorted due to optical issues. I also applied the Pixinsight function HDRMT to get a slightly sharper result for the main galaxy. The net effect is that these changes allow me to present the image in a much wider field of view.
  10. I'd been struggling with gettings subs longer than 60 seconds unguided, as I had to throw away over half of them. I suspected that it was due to periodic errors with the gears or similar with my Celestron AVX. I am using a 2.25 barlow, so my 130slt OTA was very prone to small errors. I looked into doing PEC training, and performed that on this night, and oh holy grail if that didn't produce miracles! I had only done two trainings and averaged them, and I then went from doing 60 second subs, and throwing half of them away, into doing 180 seconds unguided subs without hardly throwing any of them away! This really made me grin like a maniac that night, as it was just like flicking a switch and everything worked perfectly! So I immediately went to shoot a new target, which became M63. I had looked for galaxies to photograph and this one looked very appealing to me, from the images I found. I ended up gathering a total of 42 subs (+ the ones I ended up throwing away due to satellites, focus slip, dew on secondary etc), and 25 subs! There is still a lot of aspects I can improve on, but the simple fact that my capabilities took such a leap on one single night, simply amazed me, and definitely made up for the weeks on end that it has been cloudy/too windy! My polar alignment was very good that night, so I could probably have pushed it more, but I thought I should rather stay safe, and learn gradually. Processing is also something that still needs quite a bit of practise. I did like 5-6 versions of this one, and this is the one I liked the best of them. 42 Subs 180s Exposure 2 Hours 6 Minutes light data 25 Darks Iso 6400 Celestron SLT 130 OTA + Celestron AVX Mount Baader 2.25x Barlow Nikon D5200 Nikon Backyard, Stellarium, Photoshop CS2
  11. My first go with my Esprit 150 at the Sunflower galaxy. The image is an LRGB composition and represents just over 10 hours integration time. Post processing followed by normal workflow with the exception that I found that the very bright stars required special attention to keep them under control. Alan LIGHTS: L:11, R:19, G:15. B:17 x 600s, DARKS:30, FLATS:40, BIAS:100 all at -20C.
  12. An LRGB image of the Sunflower galaxy. The image was taken with my SW Esprit 150 and SX Trius 814 camera and represents just over 10 hours integration time. I gave the very bright stars near the galaxy a very modest stretch and then blended this result with the result of the more highly stretched galaxy image. This approach generated some star colour and also reduced their distraction effect, in addition, it also allowed some faint nebulosity that surrounds the galaxy to be displayed. The image was processed with my normal workflow which uses three software packages: CCDstack: calibration, stacking & error rejection, Lum deconvolution and DDP stretch, RGB combination Photoshop: mask generation(s), High Pass Filter, colour enhancements, noise reduction Pixinsight: gradient reduction (DBE), Photometric colour calibration, green reduction (SCNR), noise reduction (TGVDenoise), sharpening (MLT). The image was previously posted in the Deep Sky imaging section. Alan LIGHTS: L:11, R:19, G:15. B:17 x 600s, DARKS:30, FLATS:40, BIAS:100 all at -20C.
  13. While I wait for another clear night, I thought I'd attempt to improve my processing skills with another go at an LRGB +Ha M63 image which I acquired in 2016. The main difference is that I've now corrected the starfield for optical defects, allowing me to present it in a much wider field of view. My original attempt is in my gallery Deep Sky II. What I hadn't appreciated was the vast number of galaxies that I'd also captured, some of which I got Pixinsight to identify below. Alan
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