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Thread: Stars in the night

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    Default Stars in the night

    Clear sky a month or so ago.
    The Sun had already set well beyond horizon, but the Moon just got out.

    60 sec exposure @ f3.5 (fisheye), ISO1600.




    Just for comparison and contrast, tele shot from the same location, this time a lot different perspective

    Last edited by Mar; 03-18-2011 at 02:51 PM.
    Cheers,
    Marin

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    Default Re: Stars in the night

    I really like them, but am very disappointed with the CA in the fisheye lens - is it the Olympus 8mm?

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    Default Re: Stars in the night

    Quote Originally Posted by Alan Baxter View Post
    I really like them, but am very disappointed with the CA in the fisheye lens - is it the Olympus 8mm?
    At 60s exposure, I suspect it's the stars that have moved.

    Great photos by the way.
    flickr | "God made the integers; all else is the work of man" - Leopold Kronecker

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    Default Re: Stars in the night

    Quote Originally Posted by tomsi42 View Post
    At 60s exposure, I suspect it's the stars that have moved.

    Great photos by the way.

    Only the blue bits have moved.

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    Default Re: Stars in the night

    Hmm.. I wonder... The "trails" of the stars in the left have a different angle as the "trails" of the stars in the right of the image. If trails, shouldn't they be parallell?

    I really like the first shot and like Daniel I'm envyous about the clear skies you obviously have.
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    Default Re: Stars in the night

    Quote Originally Posted by Alan Baxter View Post
    I really like them, but am very disappointed with the CA in the fisheye lens - is it the Olympus 8mm?
    Must be the Olympus 8mm, camera is E-5 (exif). The Panasonic 8mm FE is a micro4/3 model.

    @Marin: Did you run the image through de-fishing software?
    Last edited by Henk Peter; 03-19-2011 at 04:09 AM. Reason: @Marin
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    Default Re: Stars in the night

    I suspect some of the stars/trails are hot pixels... I know if I shoot star fields with no noise reduction I end up with a lot of them
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    Default Re: Stars in the night

    Wow, CA/PF can really stir a debate

    This is the crop:


    As you can see, it's bit weird. I don't know if this is CA because there's no CA/PF on some other stars.
    Also, the image is cropped by about 50% because the bottom half of the image was the ground/road in the dark.

    8mm fisheye is certainly susceptible to CA/PF in high contrast areas, but it's relatively easy to correct in ACR.

    There were no hot pixels since I used Noise reduction (dark frame subtraction) and smoothened it up a bit in topaz afterwards.

    Few of these brighter stars have the blue "ghosts" attached, but slightly dimmer ones are OK.

    Personally, I don't care - it's looks ok me.
    Cheers,
    Marin

    E-M5, 7.5mm fisheye, 12mm, 45mm, various flashes and misc.

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    Default Re: Stars in the night

    If trails, shouldn't they be parallell?
    No star trail is ever parallel. Especially noticeable in a wide view of the rotating sky.
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    Comments/criticisms are just my personal opinion and are meant to be constructive. Please feel free to do the same for me.


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    Default Re: Stars in the night

    Quote Originally Posted by MikeL View Post
    No star trail is ever parallel. Especially noticeable in a wide view of the rotating sky.

    The blue "trails" at the top right are towards the top right corner, and those at the top left are towards the top left corner. No wide view of the rotating sky ever has it colliding in the middle of the frame! I'm pretty sure it is CA.

    (and to repeat, I do like them both very much).

    Regards,

    Alan

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