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gorann

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gorann last won the day on December 22 2019

gorann had the most liked content!

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About gorann

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    White Dwarf

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    http://www.mn.uio.no/ibv/english/people/aca/gorann/index.html

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    Male
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    Astrophotography
  • Location
    Värmland, Sweden (59.77 °N)
  1. I have two Esprits, 100 and 150 and I love them, so I am sure the 120 would be an excellent scope. However, an alternative from which I have seen great images is the 130 from TS. You can see on Astrobin what "pete xl" https://www.astrobin.com/users/pete_xl/ can do with it, very impressive, and it comes at a very reasonable price. There are two versions that only differ with regard to the size of the focuser (according to TS - I asked them since I am tempted to get one myself): https://www.teleskop-express.de/shop/product_info.php/info/p6679_TS-Optics-PHOTOLINE-130-mm-f-7-FPL53-Triplet-APO-Refractor.html https://www.teleskop-express.de/shop/product_info.php/info/p7717_TS-Optics-PHOTOLINE-130-mm-f-7-FPL53-Triplet-Apo---3-7--Focuser.html and the one with the smaller focuser is in stock and in my experience TS do not lie about this but you should ask them. If you google this scope you find some good info, especially on Cloudy Nights
  2. Nice nebula but never forget to watch out for what you do to the stars while processing. Protect them with masks when you stretch the data. Ideally their cores should not be bigger (blown out) than in the unstretched image.
  3. Found a bit info on the Taurus Molecular Cloud. The large dark nebula in the centre is Barnard 7, surrounding LBN 782, a blue reflection nebula. To the left is vdB 27, lit up by the young variable star RY Tauri. Another reflection nebula to the right is illuminated by CW Tauri, also a variable. In the bottom right the eliptical galaxy IC 359 shines through the dust from 186 light years away.
  4. Thanks Richard. I have now stocked up with a RASA8 and ASI2600 waiting for darkness to arrive, with the hope to catch this kind of WF data.
  5. I finally had a go at your Taurus data. Very nice and fun to process. Mainly done in PS (except SCNRgreen in PI). I gave the colours a bost initially by using curves in Lab Color mode in PS, so I ended up with a bit more colourful version than most here. So at least it is a bit different. Thanks again Richard! No astrodarkness here for two more months. Is it OK if I post it on my Astrobin, with full credits of course?
  6. Yes Mark, the Oiii glow from the shell obviously covers the Ha inside and obscures it. A version with less Oiii should probably make the central structures stand out more clearly. So I did the experiment. I processed a version without the boosted Oiii signal (first image below) and then added this as a layer to my previous version in blend mode Lighten in PS (second image below). I like it as the central structures stand out a bit more.
  7. This is really not an easy Ha Oiii object to process (but nothing wrong with the data). When boosting the the Oiii signal that covers the whole nebula it makes the red Ha signal of the nebula look a bit dull, but mabe that is how it should be. In any case, here is a new version (selective colour tweak in PS) where I think the nebula stands out a bit more.
  8. I also had a go at your data. I used PS and made a synthetic green by mixing Oiii and Ha 50:50. Stretching it made the Ha signal to overwhelm the blue. So I did a separate stretch of the blu channel to bring out that outer Oiii shell. Some mild NR applied to the Oiii data (Noels actions). Then I tweaked the colours using curves and selective color in PS. I also gave it a dose of HDRM in PI. No star shrinking neccessary. Like Carole I felt I needed to rotate the image 180°. Thanks for sharing your data - defenitively nothing wrong with it and great fun especially since there is no astrodarkness here until late August! EDIT: I added a second version with more Ha in the background.
  9. A great start from a very nice looking obsy. Northern Ireland phone companies must be very liberal to let you climb their poles and move their cables, or was it a matter of better asking for forgiveness than permission?
  10. I wonder if the L-extreme would work on my RASA8 f/2 and ASI2600 - any news on how fast scopes it could handle?
  11. At least you almost have some astrodarkness. This is what CO looks like up here at 60° N right now, close to midsummer. Have to wait until late August before there is any reason to open up the obsies.
  12. Just a small correction: Baader filters are 2 mm thick.
  13. Thinking more about this and reading Dave's comment I think it is almost certain that the reflections are going on between the chip and the filter and have nothing to do with the scope except that it grasps more light than your refractor and in this case from a very bright star. Turning your refractor towards Vega could possibly create the same ring phenomenon. It may be that you could sove the problem with turning the filters as Dave suggest but it could also be that the filters you use (ZWO?) are not the best and may vary in quality.
  14. I have no better ideas regarding the reflection rings but I know that the odd pattern around the brightest star (52 Cygni) is the well-known microlensing artifact that the microlenses on the ASI1600 chip give, and there is no way around that (you will also see it around bright stars with your refractor). A lot of people are happy imaging with Edge HD scopes (including me) so I expect that you will find a way to solve the issue with the ring-reflections. If not, these reflections are probably only going to be apparent if you have a very bright star in your image, so you may want to choose your targets accordingly. As I said, bright stars also do not go well with the ASI1600 due to the microlensing.
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