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gorann

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gorann last won the day on March 18

gorann had the most liked content!

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About gorann

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    Sub Dwarf

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

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  • Gender
    Male
  • Interests
    Astrophotography
  • Location
    Värmland, Sweden (59.77 °N)
  1. Amazing image Adam! I like it a lot! However, I am not so sure about the title. Being a scientist I am a bit allergic to the word "creation" and in any case the structures in that image is just a few million years old - so about 14 billion years after the big bang (or whatever "created" the universe), so a bit too late even for a creation. But as I say an amazing image!
  2. gorann

    william optics flt 132 vs takahashi tsa 120

    Why just these two scopes? In that price range you could consider an Esprit 150 which is likely to outperform both of them and if you get it from FLO you can get it tested by Es before delivery.
  3. gorann

    RGB like NB images

    I agree that in most cases Ha is much stronger than Sii but you may then argue that you should put at least 50% Sii into the red channel or that Sii signal becomes even weaker or lost. Not sure why you would put 100% Oiii into green, but it is worth a try. In any case the way I have done my processing is to stretch each filter first so that they become rather even in signal (while I protect the stars) so that Ha does not become totally dominant when I combine them. Due to the weak Oiii and particularly Sii signals I usually give these a bit of noise reduction to match up to the noise level of Ha before I combine them. Then I often try to see if it helps to use a bit of Ha as luminace to boost the details Are you saying you want me to have a try at some of your data? I would be happy to do that.
  4. gorann

    RGB like NB images

    Thanks a lot!
  5. gorann

    RGB like NB images

    Thanks simmo. Much appreciated!
  6. gorann

    RGB like NB images

    While waiting for astrodarkness to return to my latitude I need to keep my processing up and I have again entertained myself by processing other peoples data. Lately I have used backyard data from the Astrobin Public Data Pool uploaded by Christopher Gomez (using a TPO RC8 in Florida) and Theodore Arampatzoglou (using a WO FLT110 in Greece). Their own excellent versions (seen on Astrobin) have been in the SHO (Hubble) palette so I went for something different, inspired by Ola Skarpen's mix of NB data into an RGB like palette. In my versions of these images I used a 50:50 mix of Ha and Sii for the red channel, 15 - 50 % Ha mixed with Oiii for the green channel, and 100% Oiii for the blue channel. So, in contrast to the Hubble patette where the red Ha signal all goes to green, in my palette red emission goes to red, with some Ha into green. Blue Oiii is blue of course. The overall impression I think is that of RGB images but often with a bit more detail. A bonus is hat I also get relatively natural star colours (and they are not all white). The SHO (Hubble) palette may show even more detail as it completely separates the signals from each filter, and I have started experimenting with making a separate SHO image that I turn monochrome and use as lum for my RGB like palette. However, for the images I post here that has not been done. The objects are: the centre of the Soul nebula, part of the Great Wall of NGC7000, IC410 (the Tadpoles) and IC1795 (part of the Heart Nebula) PS. The IC1795 image is actually a bicolor NB image (only Ha and Oiii) so here I put Ha to red, Oiii to blue and mixed them 50:50 for green. Comments and suggestions most welcome!
  7. Yes, this project has great potential as your images show. A lot of detail there. Right now they are a bit too noisy, maybe also becasue you pushed the data a bit too far but then it is not a finnished product yet as you say. If the clouds would start to conspire against you, you could always pull back in sharpness and add some NR and you would have a perfectly presentable image.
  8. That is what I thought. I do the same thing if I stop down. I assume you use one of those filter ring kits they sell on ebay for nothing.
  9. Yes very nice image for imagination! Since your stars show no sign of spikes I assume you did not use the internal iris to stop down the lens but an aperture ring of some sort?
  10. gorann

    Ngc 6914 Hargb

    I see. I ecpect (=hope) that OSC could work rather well also for NB. What filter are you using ro block UV/IR for the ASI071?
  11. gorann

    Gamma Cygni in HaSHO with RGB Stars

    But when you added the NB data it turned from blue to violet suggesting that you had a halo in one or more of the NB images. Have you looked for the halo in your separate NB filter images?
  12. Interesting thread. I assume you have seen this ad for a Starfire 152 f/9 for sale in the UK: http://www.astrobuysell.com/uk/propview.php?view=139374 Quite tempting but I bought an Esprit 150 a few months ago (actually for exactly the same price)
  13. gorann

    Gamma Cygni in HaSHO with RGB Stars

    I could live with that image for a long time Rodd!
  14. gorann

    Ngc 6914 Hargb

    Thanks Richard, that gives me somewhere to start. Yes, I realized that I need some kind of filter that blocks UV and IR or I would en up with quite fuzzy images, since normal scopes are not corrected outside the visual range and that camera (unlike DSLRs) lacks any filter and therefore goes way beyond visual light in both directions of the spectrum. I could either use my Hutech IDAS filter or (since I have very litte light pollution) just my ordinary Baader lum filter (=IR/UV cut filter). I expect that you use your smaller chipped ASI1600 mono for the Ha. Have you tried using the 071 for Ha so you do not lose so much FOW. Maybe it is good enough even if it has a bayer mask?
  15. gorann

    Gamma Cygni in HaSHO with RGB Stars

    You should be very happy with producing such an outstanding image Rodd, wherever that reflection nebula is (probably at 7 oclock as you say)
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