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Star trail showing white 'vignetting'?

  • 07-01-2017 02:54PM
    #1
    fred344
    Registered Users, Registered Users 2 Posts: 13 ✭


    I took this star trail photo recently and noticed the top corners showing a purple-white glow. Does anyone know what is causing this?

    I know the bottom 2 corners are darker showing vignetting which I would expect but I can't explain the top 2 corners of the image.

    It was taken in dark skies with no street lights in Ballingskelligs, Kerry.

    Nikon D3000
    30 minutes
    18mm
    ISO 100
    f/3.5 (Wide Open)

    Thanks!
    Tagged:


Comments

  • #2
    murphyme2010
    Registered Users, Registered Users 2 Posts: 234 ✭✭murphyme2010


    Could it be amp glow?

    Michael.


  • #3
    fred344
    Registered Users, Registered Users 2 Posts: 13 ✭fred344


    It is indeed. Looked it up there. I should have applied a dark frame to it. Thanks!


  • #4
    Iancar29
    Registered Users, Registered Users 2 Posts: 5,068 ✭✭✭Iancar29


    Did you just do you single 30 minute exposure?

    That can ruin your sensor. You need to be doing say 1hr's worth of 30second exposures with a 4-5 sec interval in between to let your sensor cool down.

    Also your focus is not set to infinity.


  • #5
    fred344
    Registered Users, Registered Users 2 Posts: 13 ✭fred344


    Yes. First time trying it so I know now that multiple shorter exposures are better. I know its out of focus. Focus was set to infinity but that does not necessarily mean its focused. ;)


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