flash question.

Discussion in 'Photography Beginners' Forum' started by ImNick, May 16, 2010.

  1. ImNick

    ImNick TPF Noob!

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    I just bought a Nikon SB-600 today. And i was wondering how you get the camera to exceed the flash settings or whatever its called on the camera. so, basically so it can shoot faster than 1/200. I have a D3000. Is the camera able to do this? or is it possible to achieve faster shutter speeds with this model of camera?
     
    Last edited: May 16, 2010
  2. D-B-J

    D-B-J Been spending a lot of time on here!

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    not that i know of, because once you pass the fastest sync-speed, you get black lines on the top and bottom of your images from the shutter.
     
  3. rallysman

    rallysman TPF Noob!

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    this
     
  4. ImNick

    ImNick TPF Noob!

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    well it says it is possible in the two of the booklets that came with the flash but doesnt say how to do so.
     
  5. D-B-J

    D-B-J Been spending a lot of time on here!

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    have a faster-sync-speed? I know i can push my camera one notch above the maximum sync-speed, and be ok. Much more and i get lil lines.
     
  6. KmH

    KmH Helping photographers learn to fish Supporting Member

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    Nikon calls it FP sync mode or Auto FP, but I don't think the D3000 has that feature, but the SB-600 certainly does.

    Look in your users manual index (the one of the white disc), for FP sync mode. (flash modes starts on page 59. Optional flash unit info starts on page 162, but I don't see anything about FP sync mode. As always familiarity with your users manual is always helpful.)

    The camera shutter is made of 2 curtains. Nikon calls them the front and rear curtains.

    The front curtain drops exposing the image sensor and then the rear custain drop scovering the image sensor back up. They both then reset to the top for the next exposure.

    At shutter speeds longer than 1/200, the rear curtain doesn't start to close until some time after the front curtain has dropped all the way down. At shutter speeds faster than 1/200 the rear curtain starts to close BEFORE the front curtain has fully opened making the shutter opening a slit. The slit gets smaller as shutter speed is increased as the rear curtain has to start closing sooner and sooner after the front curtain starts to move.

    The speedlight has to fire multiple times during an FP exposure so the image sensor sees a lit scene for each width of the slit. The faster the shutter speed, the narrower the slit, the more times during a single exposure the speedlight has to fire.

    The speedlight cannot fire at full power and still have enough time to recharge the capacitors for another full power shot. Even firing rapidly at only partial power is very draining on the speedlight's batteries.
     
    Last edited: May 16, 2010

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