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    MrDanner's Avatar
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    Default Imaging over multiple nights...



    I'm not quite sure how to do this. It's probably easy, but I want to be sure.

    I imaged a portion of the North America nebula last night and some more tonight. Last night, I captured 7 images as well as flats. Then tonight, I captured 10 more of the same composition, although slightly rotated from last night because my camera wasn't in the price same position. I also captured flats for tonights images.

    I'm using nebulosity to process and stack. Is there any special way to process each set of flats for the associated night's images? I know I can't combine them all since each set of flats goes only with the associated lights. Just not sure how to proceed with combining multiple nights images and calibration frames.
    Dan S.
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    Telescope -- Stellarvue SV80ST2 80mm refractor on a Celestron CGEM mount
    Cameras -- Atik 314L+ mono | Canon T2i modded by Brent Oliver
    Guiding -- Orion SSAG with the Orion 50mm Mini Guide Scope
    Software -- Sequence Generator Pro | Stellarium | PHD | Nebulosity | Photoshop CS6 | DSS

  2. #2
    MrDanner's Avatar
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    Default Re: Imaging over multiple nights...

    Ok, I just did more reading and I probably posted this question too soon.

    It seems in Nebulosity, I can process each set of images with common darks and bias, but with each individual set of flats. Then I would stack each processed image. Sounds easy enough. Sorry for the post when a little research got me the answer.

    Can't wait for the next clear night to get some OIII of this awesome target.
    Dan S.
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    Cameras -- Atik 314L+ mono | Canon T2i modded by Brent Oliver
    Guiding -- Orion SSAG with the Orion 50mm Mini Guide Scope
    Software -- Sequence Generator Pro | Stellarium | PHD | Nebulosity | Photoshop CS6 | DSS

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    SouthernOracle's Avatar
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    Default Re: Imaging over multiple nights...

    I would think you would need to use individual darks for each night unless it was the same temperature both nights. A few degrees can change the noise patterns on a DSLR from what I've read. The bias frames shouldn't matter if you share them. I haven't personally tried it since I'm just starting out. I'm sure there are other more experienced folks here to weigh in.
    Jonathan
    Scopes: Apertura AD8, AWB OneSky, 1986 Swift #856, 1980s Celestron C90 (orange) on Nexstar 4SE mount
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