Technical Question about flash (SB-600)

Discussion in 'Beyond the Basics' started by cumi, Dec 18, 2006.

  1. cumi

    cumi TPF Noob!

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    I am considering to buy an SB-600. There are some points what I don't really understand how it works, like:

    How do I get a correct exposure (D70s), when the flash not directed to the subject, but is bounced, bounced on ceiling or wall, or used with diffusor?

    The built-in flash does (some) test-flashes to measure the exposure and flashes for the photo correctly (for example like in P-mode) automatically. I can even do flash exposure corrections... How does this works, when I want to use indirect light? Does the SB-600 also does some test-flashes?

    And, how does this change, when using SB-600 off-camera (nikon wireless system), so no direct (electronic) communicaton between flash and camera. How does then the camera knows what F-stop has to be for the correct (flash-) exposure?

    Do I have to do in both of these cases manually and hoping that the exposure will be correct?

    I tried an (old) SB-28 with my D70s of course only in manual mode (because D70s needs iTTL and can not work in "old" TTL mode). All the photos were hopelessly over-exposed, regardless if I directed it to subject or bounced it on ceiling... So with SB-28, I had to calculate everything and set manually. When not directed to subject, I could only guess and try how to set the camera...
     
  2. The_Traveler

    The_Traveler Completely Counter-dependent Supporting Member

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    Not to worry, it works.
    The camera reads the exposure TTL (through the lens) and compensates.
     
  3. cumi

    cumi TPF Noob!

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    This means that the external flash does test-flashes before the real one?
     
  4. fmw

    fmw No longer a newbie, moving up!

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    No the metering system in camera controls the duration of the flash in order to get the right exposure. It happens during the exposure, not before. Take care.
     

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