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Thread: Astrophotography with wholly unsuitable equipment

  1. #1
    Don Alvarez's Avatar
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    Default Astrophotography with wholly unsuitable equipment



    Actually, It came out better than I expected. This is like three minutes or so using my ZWO ASI224MC through the Infinity 80 on the Celestron GT Nexstar mount. I just used a Sparpcap live stack of like 12s exposures:

    Telescopes: 10" SkyLine Dobsonian, Celestron Nextar GT90, Meade Infinity 80
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    Default Re: Astrophotography with wholly unsuitable equipment

    That's pretty darn cool, Alvarez!
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    Don Alvarez (01-11-2019)

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    Default Re: Astrophotography with wholly unsuitable equipment

    How can I keep some of these stars from becoming overexposed, or is this just a limitation of my equipment?
    Telescopes: 10" SkyLine Dobsonian, Celestron Nextar GT90, Meade Infinity 80
    EP: The Five Fingers of Doom: 5.5mm, 8.8mm, 14mm, 20mm, 24mm Meade 5000 UWA's
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    Binocs: 15x70 Celestron Skymaster, 10x50 Levenhuk Karma Pro, 10x42 Bushnell, 8x42 Sans & Streiffe

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    Default Re: Astrophotography with wholly unsuitable equipment

    Nice job on a difficult target.

    Quote Originally Posted by Don Alvarez View Post
    How can I keep some of these stars from becoming overexposed, or is this just a limitation of my equipment?
    It is a limitation of M42! The dynamic range is extreme, so there is no way to get the Trapezium stars properly exposed without losing most of the nebula, and no way to get the nebula decently exposed without overexposing the Trap. The trick is to take short exposures (~10 sec) for the stars, longer exposures for the inner part of the nebula, and quite long exposures for the dim outer nebula. When you combine the frames in processing, either using HDR techniques or just straight stacking, the short exposures will preserve detail in the bright areas.

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    Default Re: Astrophotography with wholly unsuitable equipment

    Quote Originally Posted by KathyNS View Post
    Nice job on a difficult target.



    It is a limitation of M42! The dynamic range is extreme, so there is no way to get the Trapezium stars properly exposed without losing most of the nebula, and no way to get the nebula decently exposed without overexposing the Trap. The trick is to take short exposures (~10 sec) for the stars, longer exposures for the inner part of the nebula, and quite long exposures for the dim outer nebula. When you combine the frames in processing, either using HDR techniques or just straight stacking, the short exposures will preserve detail in the bright areas.
    It's the same with Jupiter's moons. You need a bit of digital wizardry to combine longer and shorter exposures.
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    Default Re: Astrophotography with wholly unsuitable equipment

    Nice job.
    Clear skies
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    Default Re: Astrophotography with wholly unsuitable equipment

    Great start!

    Joe
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