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alexbb

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alexbb last won the day on September 12 2018

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About alexbb

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    Romania, 45N
  1. If you have data covering the whole (or even wider) area, check this out: https://pixinsight.com/tutorials/multiscale-gradient-correction/
  2. Thank you all very much! This is, in fact, only half of the original resolution. I also started thinking how to compose the multi panel images in order to fit better some more common ratios for printing. At 9260x8730 it should come out fairly large without overscaling the image. I'm currently shooting some R, not sure if it's worth it under the moon, but I don't expect much either. I'll see if I keep the data or not. It's been quite cloudy lately and very unusually cold. We should have 30C+ during the day, but it barely warms to 20C Not that I complain...
  3. I've been less active lately in this hobby, but I've a few images done, others waiting in the pipeline to be processed. This is a "crowded" area of our Milky Way galaxy, visible all summer from the northern hemisphere. The Cygnus constellation is home of many named and nameless nebulae. Starting from the left (North), below the brightest star, Deneb, the Pelican and the North America Nebulae are very popular; going to right, just below the brightest star close to the center of the image, Sadr, lies the Gamma Cygni Nebula. A bit towards the top-right there's the Crescent Nebula and going forward top-right, there's the Tulip Nebula. Finally, at the bottom-right corner, the Veil Nebula, a super nova remnant. All these are surrounded by shiny gaseous filaments or dusty patches blocking the light. I started this during the pandemic lockdown. All of the data was captured from my hometown from a balcony brightly lit by a sodium street lamp, but the narrowband filters did their job well, blocking successfully the sodium emission. A total of 23 hours is made of 2x3 panels composed in a larger mosaic, each panel consisting in about 1h of exposure for the red Hydrogen and 3h of exposure for the cyan Oxigen, all through a Sigma 105 macro stopped at F/4, ASI1600MMC with 6nm Astronomik filters. I'm planning to shoot RGB data too and make an RGB/HOO composition. Cheers and clear skies! astrobin link: https://www.astrobin.com/r22yre/ flickr link: https://www.flickr.com/photos/170274755@N05/49939128338/
  4. There are a few sensors on the market, but not yet used in astro cameras. https://canon-cmos-sensors.com/canon-120mxs-cmos-sensor/
  5. Thank you all so much! Below M81 it's indeed another interacting galaxy, Holmberg IX.
  6. This is another multi season project. I started it back in 2018 with the acquisition of high resolution data through the disassembled 8" dob tube put on the EQ6-R. Despite the rather long integration of 8-9h on each of the 2 panels, the gradients due to light pollution prevented me to stretch the image to reveal the IFN. Some traces of it were there, but some other streaks were not supposed to be visible. Later that season I decided to shoot some RGB and Ha too and for these I used the 150PDS which covered the whole area in a single frame. I didn't really bother to process that data as the background was so poor. But this season I restarted when I "accidentally" had an old AstroProfessional ED FPL51 equipped refractor with me. I proceeded to shoot some luminance through it after finishing shooting with another scope for the main target for that night. It appears that less than 3h of exposures through the 4" refractor under dark skies revealed a lot more information than ~17h (you can divide by 2 actually as there were 2 panels) of exposure through an 8" reflector. So the past recent days I left the city for a while because of the virus spreading and during 2 nights I went out by myself and shot another 5:30h of luminance. The conditions were not so good, but I still guesstimated the sky at a ~21 SQM. Combining the data proved really difficult as the stars through the refractor were so bloated and neither the RGB through the other scope didn't help too much either, but in the end I believe I have something decent. I will perhaps revisit once I get a more decent and larger imaging scope, be it mirrored or mirroless. You can watch the image also on astrobin and flickr. Thanks for watching! Clear skies and stay safe!
  7. Thank you, David! It is indeed a very capable and robust camera and quite cheap used. In the far future I'm thinking of modifying it, once I buy one of those new Canon mirrorless for everyday use.
  8. Thank you too! Here's one more intermediary image I used for aligning the FOV. All framing was done manually, rotating the scope in the rings and slewing the mount slightly.
  9. Here are some intermediary stretched stacks All DSLR 9 panels of 1h of luminance 17.5h of Ha
  10. I've been processing this image for quite a long now. I started acquiring data the last season when I only managed to shoot 3 panels with the Canon 6D through the Esprit 80 for a total of ~7h. This season I restarted and I added more data and covered a wider area. So a mix of portrait and landscape panels were planned and shot with the same scope and camera. Now every pixel represents at least 3-4h of integration, some have more. All the above were shot from Bortle 2-3 sites where I traveled sometimes even for an hour of exposure. To the RGB data I added 17.5h of Ha, same story with the panels. Some were oriented N-S, others E-W. These were shot with the SW 72ED and the ASI1600 from home and Bortle ~7. Then I figured out I still had time and I planned and shot 9 more panels of luminance with the 72ED and ASI1600, each consisting of 1h of exposure. I combined all of these into an image, processed it and for the Orion nebula and Running Man nebula I also blended some data I shot last season with the 130PDS and ASI1600 from home. Below it's my first final version of all data combined. You can watch it in full resolution on astrobin: https://www.astrobin.com/full/jni0w8/ or Flickr: https://flic.kr/p/2iBGUXq
  11. Indeed, it will take the road back next week. On the left is Regulus through the SkyWatcher, on the right is Regulus through the TS. Both without reducer, 5s exposure. Thank you all for your support! I will discuss with them if they can send me a tested example or I will follow another route.
  12. Thank you! It might be possible to do a star test tonight, otherwise I will make a proper artificial star test. Nice tip with the pen ball! I found the backfocus to work well with the SW72ED somewhere at ~68mm. Focal length is ~430mm so I assume it should work fine with the TS scope too at the advertised ~432mm focal length. The colour image is made by all the data combined, both SW scope and TS scope. I did not post the result from the SW scope only because it seems I did a poor job when I put the Canon sensor back and I have some tilt.
  13. It was ~10m away. But shouldn't it be good enough to verify the colimation at least?
  14. I did a pseudo star test this morning. The star hole was a bit large (~1mm) to asses more optical defects, however, the out of focus disks appeared round with concentric circles.
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