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astrosatch

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About astrosatch

  • Rank
    Nebula

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  • Location
    slovenia
  1. astrosatch

    Seeing in city vs countryside

    Thanks Carole. This really brings hope for my imaging.
  2. Hi. Is there difference in seeing in town where there are houses and roads and especially in winter with chimneys and heated houses vs countryside where is grass and forest? I have telescope on balcony looking above block of flats. Would my autoguiding improve if I change the scene to more remote site? Andrej
  3. astrosatch

    Fringe killer and reflection nebula

    I use evostar ed72 which is doublet, but blue halo remains around stars. I was thinking that filter should reduce halo but not entirely dim the blueish nebula. This is the transmission of this filter. In what wavelenght does reflection nebula shine? Or from where in blue specter does it start to fade? thanks for info Andrej
  4. Greetings! What would happen if I use fringe killer and image reflection nebula like M45? I would like to reduce blue halo around stars but I'm not sure If this affects (and how much) reflection nebula because it's blue. Thanks Andrej
  5. Hi! I wonder if it is feasible to include fringe killer filter to image deep sky with ED72 apo telescope. Because it's only a doublet and it might help to reduce blue/violet halo on stars. Any thoughts? Andrej
  6. astrosatch

    EVOSTAR ED72 luminance filter

    Thanks, I will look into it. Andrej
  7. astrosatch

    EVOSTAR ED72 luminance filter

    Thanks for explanation. My only problem is that I don't have pixinsight. Not yet at least. I use Startools, so if somebody has any workflow I'd be grateful. What about if I use fringe killer filter in front of L filter, would that help things? Andrej
  8. astrosatch

    EVOSTAR ED72 luminance filter

    Does this mean that I shouldn't use L filter and use only RGB and create synthetic luminance or use L for nebulosity and RGB for stars? And if so, how should I do it? Andrej
  9. Hi! I have skywatcher EVOSTAR ED72 and ASI1600mm pro with filters. I wonder how good is this telescope for LRGB imaging. The filters seems to be parfocal, but when imaging the focus point of filters is not the same. I know that between every filter change I should refocus but what about L filter? This creates bigger stars. Is this increased light hitting the sensor because of wider spectrum of L filter or is cause the cromatic aberration? Are minus violet filters like fringe kill or contrast booster and others helpfull in this case? I would use them only with L filter to reduce Blue halo. Or should I use them with blue filter also? Or not use them at all? Any help or experience would be great. Br, Andrej
  10. What do you mean bias is not good with cmos?
  11. Just a thought. Did you calibrate flats with bias? I had simmilar problems with overcorecting flats on my dslr and nothing worked until I calibrated flats with bias. Or with dark flats if they are longer exposures. But not both. If you use bias and dark flat you end up extracting bias twice and that shows as overcorecting or undercorecting on images. Andrej
  12. astrosatch

    Guiding on a star affected with coma

    Thanks all. I'm relieved. There is no coma in images, but I don't know how things looks in OAG yet because of clouds and I want to be prepared to any situation when I get to it. Andrej
  13. Hi! I recently received OAG and didn't have time to test it yet, but I have a question. I have quattro F4 telescope and aplanatic coma corrector. Should I be worried because of coma on OAG? On image of main camera the stars are ok with minimal elongation on edges. And if there is any coma on stars how would that affect autoguiding? Andrej
  14. Hi! There is so many topics relating read noise and adu values so I'd like to know how one measures it from image. I'm using nebulosity 4 and don't know how to see how much of read noise is in the image. I know something about reading mean value from pixel stats, but don't know what am I looking for. Is there calibration first or what? Thank for reply Andrej
  15. Thanks vlaiv, that helped me a lot. Now I know how to calculate noise values. Depending that I know initial values to begin with. Is there any way to read those values from image?
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