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Found 32 results

  1. This is HaRGB data that I processed from subs downloaded from the Liverpool Telescope. I had to be very selective in choosing the subs as they were quite variable, some had eggy stars and others slightly rotated or with slightly different resolution, which messed up the stacking (and some tedious detective work had to go into finding the guilty ones). Exposures used varied between 60 and 120 s. The following filters were used: sdss-r (red), Bessell-B (blue), Bessell-V (green) and Ha6566. Could not find any clear filter subs to use for lum. Totally, 58 subs, so about 1.5 hours of data from this 2 meter RC scope on La Palma. Stacked in Nebulosity 4 and processed in Photoshop CS5 I was stuck by the sharp outer edges of the nebula in some areas. It is not due to me using layer masks - it actually seems to be like that, but maybe I messed up somewhere. All comments and suggestion welcome!
  2. My first attempt at the Crab Nebula. The image is an LRGB with an Ha blend into the lum and red channels and represents about 14 hours integration time. Alan LIGHTS: L:14,R:16, G:8, B:14 x 600s, H:11 x 1800s.
  3. Toxophilus

    M1 - Crab Nebula

    From the album: Deep Sky Objects

    Messier 1 - Considerably better than my previous attempts at this object. Taken with reasonable guiding, with reasonable seeing conditions (allowing for the light pollution). I had a restricted time window for this image caused by a combination of cloud and the target getting close to roofs of houses. I tried a different technique to deal with the light pollution, by putting a light pollution filter on the front on the filter wheel nose and then imaging as normal. The addition of the extra filter did not affect the parfocal nature of the Xagyl LRGB filters used. For more information the AstroBin Link is: http://www.astrobin.com/243527/
  4. alan4908

    Crab Nebula (M1)

    From the album: Deep Sky III

    My first attempt at the Crab Nebula (M1). The cropped image is a LRGB with Ha blended into the Lum and Red channels and represents about 14 hours integration. I was quite pleased with the amount of detail revealed. LIGHTS: L:14,R:16, G:8, B:14 x 600s, H:11 x 1800s. DARKS:30, BIAS:100, FLATS: 40.
  5. Hi all, here is my first image for this website and first challenge here M1 (Crab Nebula) - SNR in Taurus Narrowband image (Ha - 3 hours, OIII - 3 hours, SII - 3 hours) Taken with GSO RC 6" + ZWO ASI1600MM with ZWO EFW + Optolong NB filters. Thank you
  6. M1 captured 13th March 2016 with 127mm F7.5 APO triplet 0.8x reducer; Skywatcher AZ-EQ6-GT, Atik 314L+ OSC, Sequence Generator Pro, PixInsight. Not sure I've got the focus nailed although it was set using the auto focus routine in SGP. 14 600sec light frames with superbias from 200frames and 50 flats. No darks used (conscious decision following comments on this forum about the need for them). PixInsight Process; Preprocess -> Super Bias from bias frames - Master flat from flats with bias subtracted - Light Frames calibrated, debayered, cosmetic corrected, weighted, registered and integrated. Processing - Dynamic Crop - Dynamic Background Extraction - Colour Calibration - SNCR - MLT Noise Reduction (masked) - Stretched with Masked Stretch - Local Histogram Equalisation (masked) - Curves transformation - MLT Noise Reduction (masked) - ACDNR - Reduce Colour background/contrast with MLT (masked) and Histogram Transformation(masked) - Curves Transformation - Boost Colour in nebula with MLT (masked) and Colour Saturation - Curves Saturation overall - and Curves Saturation to stars only (masked) . Any pointers on steps to improve it or ways to improve my processing welcomed - still wading through tutorials and videos to get my head round PixInsight
  7. The fine, dry conditions that we had for a few nights in the last couple of weeks enabled me to capture about 9 hours of narrowband data of M1. I need to capture some new flats following a slight change to the imaging train so the image below is not as good as it might be but it still is worth showing, I hope. I'll reprocess when I have the new flats and post an update. Equipment: TS (GSO) 12" truss RC (Operating at 1700 mm Focal Length with AP focal reducer) with modified back plate, Mesu200, Atik383L+, Atik EFW2, Lodestar X2 on Atik OAG Captured with MaxImDl and processed in Pixinsight. Exposure: S-II=H-A=O-III = 12 x 900s each filter. Combined using SHO script in Pixinsight and composited with a synthetic luminance made from all the subs. The colormask (sic) script in PI was helpful in modifying the image to a more pleasing (to my eye) colour palette. Derrick
  8. So, with the Moon not rising until just after 10pm and the littl'un in bed soon after 7pm, a window of opportunity. I was ready with cooled scope soon after 8pm and began the evening with M1 (The Crab Nebula). A fine sight in the 15mm eyepiece. Quite a large nebula, which appeared rectangular and slightly grainy when UHC filtered. This was the first time I had seen it for over two years. M35 was a lovely sight, with companion NGC 2158 a misty patch to the South of a group of stars South West of the main group. The use of averted vision was not necessary for this but was needed for IC 2157, a slightly more diffuse cluster further West again. Next up was 8 - Flora, an Asteroid well placed in Leo. At magnitude 9.1, it was quite easy to locate nearby to Eta Leonis. Another constellation rising quite high by this time is the magnificent Ursa Major. I managed to identify two more moderately diffuse galaxies which were in close proximity to Gamma Ursae Majoris; M109 and NGC 3953. Both of these required gentle movement of the scope to pick up. ____________________________________________________________ Observing Session: Sunday 8th February 2015, 20:10hrs to 21:40 hrs GMT VLM at Zenith: 5.0 - 5.1 ____________________________________________________________ Monday the 9th started with another clear sky and I was back out there by 8pm. I started with a quick re-alignment of my finderscope after I inadvertently loosened the wrong screws when disconnecting the night before (doh!). I began by going back to check the movement of 8 - Flora from yesterday. Before some light cloud rolled across Ursa Major / Leo, I also managed to locate NGC 2841, a bright and quite condensed galaxy near to the double star 37 Ursae Majoris which sort of makes a pair with the magnitude 8.5 star HD 80566. This is quite an easy find from the signpost stars Theta and 26 Ursae Majoris and is more prominent than a number of Messier objects. With cloud parked across half the sky, I finished the night with the camera trained on Orion for a few wide-angle snaps. I cannot remember the last time I had two nights running under the stars but it is nice to be back in the game. The Asteroid collection is into double figures and is ever growing; 1 - Ceres 3 - Juno 4 - Vesta 6 - Hebe 8 - Flora 9 - Metis 10 - Hygeia 12 - Victoria 13 - Egeria 15 - Eunomia (my first) ____________________________________________________________ Observing Session: Monday 9th February 2015, 20:00 hrs to 20:35 hrs GMT VLM at Zenith: 4.9 - 5.0 deteriorating as wispy cloud rolled in. New - Revisited - Failed
  9. Hi All, finally managed to get out under the stars after a long break. Went for M1 as it was in a good position for me and a target that I've never tried properly before. Managed to grab 12 x 10 mins Red, 12 x 10Mins Blue and 8 * 10mins Green. Just some simple processing with PI, Registered, Integrated, Linear fit and a masked stretch. Quick lift with curves and that was it. Hope you like, Cheers John The full frame image And a closer crop of M1
  10. Monday night was the first clear night here since 3 October and, even then, I had to dodge a few clouds. I managed to get M1 with my ED120 and modded 1200d taking 15 400sec subs at ISO 1600 with the usual darks, bias and flats. Not all the detail of M1 showing but not bad for a Canon I think. Processed in DSS Pigs in Space Pixinsight and a little bit in Paintshop Pro X8. Thanks for looking. Peter
  11. Still dipping my toes into narrowband imaging I decided to have a go a the crab nebula. Processing is done in a sort of Hubble palette with 15x10 min Ha as green, 16x10 min SII as red and 17x10 min OIII as blue. All binned 2x2 and imaged with an Atik 460 in an Orion AG12. Curves, levels, a little sharpening of the nebula and some colour adjustment. /Lars
  12. stevebb

    M1 - Crab Nebula

    From the album: Stevebb.com

    M1 Crab nebula taken using a Skywatcher Equinox ED120 on an NEQ6 Pro mount and imaged using Backyard EOS and a modified Canon 450D DSLR.

    © steve@stevebb.com

  13. Vixen 114ED refractor, NEQ6, SXV-H9, 30 x 300s Ha and O3 subs, from December...
  14. The Crab Nebula (also known as M1, NGC 1952 or Taurus A). This is quite an improvement on the last attempt at imaging M1 about two years ago. This time it was possible to bring out some of the filaments that make this object so interesting - this despite using a much shorter focal length making the object appear significantly smaller. The image is cropped rather radically to show more details in the nebula so the stars appear bigger than I would prefer, but on the original they look fine. 040 x 300 second exposures at Unity Gain (139) cooled to -20°C 050 x dark frames 040 x flat frames 100 x bias frames Binning 1x1 Total integration time = 3 hours and 20 minutes Captured with APT Guided with PHD2 Processed in Nebulosity, Fitsworks, and Photoshop Equipment Telescope: Sky-Watcher Explorer-150PDS Mount: Skywatcher EQ5 Guide Scope: Orion 50mm Mini Guiding Camera: ZWO ASI120MC Imaging Camera: ZWO ASI1600MC Pro Baader Mark-III MPCC Coma Corrector Light pollution filter
  15. Crab Nebula, imaged on January 2nd 2017 13 x 8 minute exposures at 400 ISO (2 hours and 24 minutes) 10 x dark frames 10 x flat frames 21 x bias/offset frames (subtracted from flat frames only) Captured with APT Guided with PHD2 Processed in Nebulosity and Photoshop Equipment: Celestron NexStar 127 SLT Skywatcher EQ5 Mount Orion 50mm Mini Guide Scope ZWO ASI120 MC imaging and guiding camera Canon 700D DSLR
  16. Hi all Images from last week, M1, the Crab Nebula Ha - 1x20m Ha - 4x15m RGB each - abt. 5x5m bin2 Unfortunately, although my first L sub came out pretty as you please, mist came up, so no L. Again, no calibration frames..never seem to get around to it. On the first one, I favored Ha (HaRGB, Ha mapped to red, Ha as pure lum., thus less stars), the second one is a combo of HaR mapped to red, and HaR as lum., to keep the regular spectrum stars. Andy
  17. Well last night was one of those rare nights where it all comes together. The weather, equipment, guiding and everything in between. I intended to stick with just the one target but got carried away with the excellent conditions and ended up starting 4 Anyway after 10 hours over 23/11/14 and 24/11/14 heres what I have so far. Thanks for looking. Usual stuff: SW Equinox 80 APO, EQ5 Pro Synscan GOTO. Guiding: SW 9x 50 finder guider and QHY5. Modded Canon 600D and coma corrector with CLS clip filter. Using: BYEOS, PHD, DSS, Photoshop CC. M42 - Orion Nebula - Finished Image ISO 400 5 X 300 second light frames 6 x 600 second light frames 15 x 30 second light frames 10 x 10 second light frames 40 x Flats 20 x Bias 20 X Darks M42 ORION NEBULA DSLR by VikN46, on Flickr M1 - Crab Nebula ISO 400 6 x 600 second light frames 40 X Flats 20 x Bias 20 X Darks M1 CRAB NEBULA 1.1 by VikN46, on Flickr M1 CRAB NEBULA CROP DSLR by VikN46, on Flickr IC 405 - Flaming Star Nebula ISO 400 10 x 600 second light frames 1 x 1200 second light frames 40 x Flats 20 x Bias 20 X Darks IC 405 Flaming Star Nebula by VikN46, on Flickr AND FINALY.. IC 434 - Horsehead Nebula ISO 400 5 x 600 second light frames 40 x Flats 20 x Bias 20 X Darks IC 434 HORSE HEAD NEBULA DSLR by VikN46, on Flickr
  18. We're gradually learning our way into some basic deep sky imaging with our relatively straightforward set up. Imaging M1, the Crab nebula, is probably our most challenging object so far. We're using a Nikon D50 mounted at prime focus of a SW 200p and tracking is achieved with the SW dual axis motors on a polar aligned EQ5. In our previous attempts we stored the images as jpeg files from the start. This time we used the Nikon raw file format and read the images directly into Deep Sky Stacker. This all worked fine and DSS was happy with the format. The first issue we had came with a warning during the processing that we were running low on disc space and I managed to shovel some large directories onto another disc (actually a different partition) while the processing continued. However, the real blocker was an "out of memory" message that popped up. Not surprising we thought as the laptop only has 1 Gb of RAM. This morning we put all the files onto our main PC, which has significantly more memory and disc space. We still had issues with memory but we got around this by not using 2x drizzle and including only the highest scoring sub images in the set. The final image, shown here, had the levels tweaked in photoshop. We used the small set of darks but we haven't yet got as far as worrying about flats. Compared to previous attempts it's clear that the focusing isn't quite right and maybe it's time to think of a Bahtinov mask to make absolutely sure. The tracking wasn't as good this time either and I now realise that the telescope may have not been ideally balanced on the mount. In retrospect I should have balanced the scope (positioned the tube in the rings) with the SLR in place before lining up on M1 using my 20 mm EP (being a bit out of balance with the EP wouldn't have been as important). I haven't found it possible to move the scope down an inch or so through the rings to rebalance without altering the alignment. The image is composed of 18 x 30 s subs with only 3 darks at an ISO of 800. Having done a little bit of reading about what is ideally required for dark images, and from advice in previous posts, I realise that a greater number of darks are required to reduce noise rather than contribute to it. Ideally the darks should be taken with the camera in as close a condition as it was when the lights were taken in terms of temperature and just before and after the series of lights were taken. I also realise that longer exposures are needed to minimise noise - but that then opens up issues with tracking accuracy and, at least for the foreseeable future, we're quite happy to stick to this rather than have the complications of guiding as we like the simplicity of our current set up. If the tracking etc looks good then we'll certainly experiment with exposure time next. The main purpose of this image, apart from attempting to capture M1, was to see if we could process the lights with accompanying darks through DSS via the Nikon raw format. That all worked but it is a little concerning that we had issues with computer resources on a fairly small data set. I assume that it's possible to break things down in to smaller sets and stack the resulting tiff files in DSS without corrections applied but this seems a bit clunky. Any tips or thoughts would be greatly appreciated.
  19. From the album: DoctorD's Photos

    102MAK with F3.3 reducer and Baader Moon & Skyglow filter at 30s exposure
  20. Like many people, I was out with the scope for the first time in ages last night taking advantage of the one clear night . As the forecast for the rest of the month was looking dreadful, I decided to give the Crab Nebula the One night treatment with my Esprit 120ED. It was a bit blustery, so the tracking was not the best, hence the shape of most of the stars , but you can't have everything going your way . All details of how I captured the image are on Astrobin, but any questions / comment, please ask / give . http://www.astrobin.com/231113/
  21. Hi! My next 3 images from December 2015, May 2016 and February 2016. All taken with Nikon D7200, SW150/750 and guided HEQ5Pro at Lisow (35km from Czestochowa, Poland) BTW I've got a question... Which settings are better for D7200? Higher ISO (eq. 1600) and 300sec frames or lower (ISO400 or 800) and 480sec light frames? M81 and M82 (May 2016) 7x300s ISO800 3x dark M33 (December 2015) 11x300s ISO1600 only 1 dark frame M1 (February 2016) 3x300s ISO800 3x dark (only 3 light frames because of very poor weather and high clouds) Tomek
  22. Here is the crab nebula with my RGB data from two nights ago. That was a night that allowed 1.5 hours of data before the moon and mist sent me to bed. To this I added monochrome data (red filtered) from a glass plate taken during the 1990ties Palomar Observatory Sky Survey (put in as luminosity). So, a mix spanning about 20 years. My data was taken with a 5 " ES apo and Canon 60Da (15 x 6 min, ISO1600 naturally chilled by the ambient -7°C). All done in PS CS5. For anyone interested in spicing up their RGB data, POSS2 data can be downloaded from: http://archive.stsci.edu/cgi-bin/dss_form Here is first the final product with a zoom in showing some detail. I also post my RGB (I am sure I could do better with more time and less mist) and the POSS2 data. Comments most welcome.
  23. From the album: DSO, Nebula, Galaxies, Comets etc

    M1 The Crab Nebula 30.12.2016 Taken using Atik 314L monochrome CCD and Celestron 8SE SCT telescope 10 x 300 seconds H-alpha, 10 x 300 seconds OIII and 10 x 300 second darks Narrowband data assigned to colour channels to give a bi-colour image and lightly processed in PS

    © vicky050373

  24. From the album: DSO, Nebula, Galaxies, Comets etc

    M1 The Crab Nebula 3 x 600 seconds H-alpha and 3 x 600 seconds OIII

    © vicky050373

  25. Second weekend session and im revisiting some of my early targets again M1 and the Lio trio about 3.5h or 10 min exposures iso800 but only about an hour on the horse. It also suffered from some high cloud last night so its a bit noisy but im realy chuffed with the improvements im seeing from my (much) earlier attempts, having a bit of an issue with color balancing the modded Cannon and CLS filter. However, it feels like its all coming together a bit better. Still have a way to go with processing but i can do that when its cloudy! Jupiter was just nudging above the neighbours house when i was packing up so had my first view of him of the year to round things off....nice evening
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