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  1. #1
    Panarus biarmicus Moderator (Sports) SmartWombat's Avatar
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    Mar 2004
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    Spot the mistake ...

    Ah, no, not the colour cast from the sodium lights, the other one.

    When you're photographing TV images, it helps to understand how TV works.
    Here in the UK we use the PAL standard, 25 frames per second made up of 50 interlaced fields per second.
    So if you shoot at 1/50 second the screen will be about 1/2 brightness because you'll only capture the odd or even lines of the picture. If you shoot at 1/25 second then you will get both the odd end even lines.

    But if you shoot at 1/60 second then there will be a dark band because it's faster than the refresh rate of the image.


    OK, if you live in America that's all back to front.
    You use the NTSC standard with uses 30 frames and 60 fields per second, not 25/50.
    So you need to use 1/30 or 1/60 for proper exposure.

    If I forget what country I'm in and user 1/50 in the USA then I get bright lines on the screen instead of a properly exposed image.
    Attached Thumbnails Attached Thumbnails Spot the mistake ...-_1150442.jpg  
    PAul

    Scroll down to the Sports Forum and post your sports pictures !

  2. #2
    Senior Member freygr's Avatar
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    Feb 2005
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    Portland, OR, USA
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    Re: Spot the mistake ...

    Quote Originally Posted by SmartWombat
    Ah, no, not the colour cast from the sodium lights, the other one.

    When you're photographing TV images, it helps to understand how TV works.
    Here in the UK we use the PAL standard, 25 frames per second made up of 50 interlaced fields per second.
    So if you shoot at 1/50 second the screen will be about 1/2 brightness because you'll only capture the odd or even lines of the picture. If you shoot at 1/25 second then you will get both the odd end even lines.

    But if you shoot at 1/60 second then there will be a dark band because it's faster than the refresh rate of the image.


    OK, if you live in America that's all back to front.
    You use the NTSC standard with uses 30 frames and 60 fields per second, not 25/50.
    So you need to use 1/30 or 1/60 for proper exposure.

    If I forget what country I'm in and user 1/50 in the USA then I get bright lines on the screen instead of a properly exposed image.
    Simple Shutter was faster than the refresh rate of the video.
    GRF

    Panorama Madness:

    Nikon D800, 50mm F1.4D AF, 16-35mm, 28-200mm & 70-300mm

  3. #3
    Junior Member
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    40

    Re: Spot the mistake ...

    I would have guessed the mistake was that you took a photo of the ugliest car there and it almost broke your camera. :P

  4. #4
    Panarus biarmicus Moderator (Sports) SmartWombat's Avatar
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    Re: Spot the mistake ...

    Broke the camera? No chance, I've owned 6 of them and all my cameras since then (apart from one I dropped 5 times) survived.
    PAul

    Scroll down to the Sports Forum and post your sports pictures !

  5. #5
    COEXIST DGK*CRONE's Avatar
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    Aug 2008
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    Santa Ana, Ca
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    Re: Spot the mistake ...

    Quote Originally Posted by Username2343
    I would have guessed the mistake was that you took a photo of the ugliest car there and it almost broke your camera. :P

    :lol: too funny
    Marco Arreguin

    All critique/advice welcome.
    Growing every day.

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