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Thread: D300 Flash sync speed

  1. #1

    Default D300 Flash sync speed

    This may be a dumb question. But how come when using the built in flash my sync speed is limited to 1/320, but with a sb-600 i have no limit on the shutter speed?

  2. #2

    Default Re: D300 Flash sync speed

    Because they have different specs. Read your manual.
    Alpha

  3. #3

    Default Re: D300 Flash sync speed

    ...Well duh. I'm asking why

    As i understand it sync speed is limited by the movement of the shutter planes across the sensor. At higher shutter speeds only a fraction of the sensor is exposed at the instant of flash and thus you would get a band of light over the area exposed when the flash fired.

    Since this is a property of the camera body why would putting a different light change this?

  4. #4

    Default Re: D300 Flash sync speed

    just curious. why is there no max sync speed when the sb600 is used? i thought its at 1/250?

  5. #5
    Moderator catchlights's Avatar
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    Default Re: D300 Flash sync speed

    Quote Originally Posted by Deluen View Post
    ...Well duh. I'm asking why

    As i understand it sync speed is limited by the movement of the shutter planes across the sensor. At higher shutter speeds only a fraction of the sensor is exposed at the instant of flash and thus you would get a band of light over the area exposed when the flash fired.

    Since this is a property of the camera body why would putting a different light change this?
    Read your D300 user's Manual, page 289.
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  6. #6
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    Default Re: D300 Flash sync speed

    Quote Originally Posted by flipfreak View Post
    just curious. why is there no max sync speed when the sb600 is used? i thought its at 1/250?
    Because with the SB600, the shutter and the flash are somehow able to synchronise at higher speeds?

    P.S- there is a maximum speed, its the camera's maximum shutterspeed

  7. #7

    Default Re: D300 Flash sync speed

    Quote Originally Posted by Deluen View Post
    This may be a dumb question. But how come when using the built in flash my sync speed is limited to 1/320, but with a sb-600 i have no limit on the shutter speed?
    Some flash power is lost to achieve this "limitless" syncing. At shutter speeds higher than 1/320, the second curtain starts to close before the first curtain is fully opened. Therefore, only a slit of the sensor is exposed at any time instance. SB-600 gives out many short pulses to make sure that everywhere on the sensor is equally lit, instead of a single strong pulse when shutter speed is below 1/320. The built-in flash simply doesn't have enough power to lose to perform a focal plane flash (FP-flash).

  8. #8

    Default Re: D300 Flash sync speed

    Quote Originally Posted by Daedalus Trent View Post
    Because with the SB600, the shutter and the flash are somehow able to synchronise at higher speeds?

    P.S- there is a maximum speed, its the camera's maximum shutterspeed
    haha. got such things meh? unless u tell me using high speed sync.

  9. #9
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    Default Re: D300 Flash sync speed

    Quote Originally Posted by flipfreak View Post
    haha. got such things meh? unless u tell me using high speed sync.
    yup. read the manual

  10. #10
    Senior Member bEnd1ck's Avatar
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    Default Re: D300 Flash sync speed

    Quote Originally Posted by flipfreak View Post
    haha. got such things meh? unless u tell me using high speed sync.
    the explanation of how it worked above does sound like high speed sync to me.

  11. #11

    Default Re: D300 Flash sync speed

    Quote Originally Posted by grantyale View Post
    Some flash power is lost to achieve this "limitless" syncing. At shutter speeds higher than 1/320, the second curtain starts to close before the first curtain is fully opened. Therefore, only a slit of the sensor is exposed at any time instance. SB-600 gives out many short pulses to make sure that everywhere on the sensor is equally lit, instead of a single strong pulse when shutter speed is below 1/320. The built-in flash simply doesn't have enough power to lose to perform a focal plane flash (FP-flash).
    Ah okay, that makes much more sense. Thanks =)

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