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Thread: Speedlite 580EX - flash underexposure problem

  1. #1

    Speedlite 580EX - flash underexposure problem

    First of all, I have information overload by spending my morning reading threads. I don't understand alot of the information and I have the same problem with the tutorials. I will keep plugging along.
    My question is: I need to take indoor pictures of a house and would like to use my 18/55 lenses for wider shots. I have taken 15 shots in my house this morning trying different settings and they all are too dark. I can't figure out what I am doing wrong. I know someone in this community can help me.
    Thank you.
    kookeer

  2. #2

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    Re: Speedlite 580EX

    Hi Kookeer,

    They say that "a picture paints a thousand words" - perhaps you could save us that many by posting a picture of a typical image that has the problem?

    Bottom line is that if the pictures are too dark then not enough light is hitting the sensor - trick is to work out why. Some possibilities ...

    - ISO set too low?

    - Aperture stopped down too much?

    - Insufficient output from the flash

    - Flash set to wrong angle or pointing in the wrong direction.

    Hopefully we can tell more if you can post an image and tell us a little more as to how your camera & flash were setup

  3. #3

    Re: Speedlite 580EX

    OK, by the way, I have a Canon 20D. I have used P, AV, TV, and M. The image I am waiting on to download was manual at "6/20.

    Speedlite 580EX - flash underexposure problem

    kookeer
    Last edited by McQ; 23rd March 2009 at 07:31 PM. Reason: embedded image

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    Re: Speedlite 580EX - flash underexposure problem

    OK - thanks for that

    It's not looking too bad. Problem is, the poor camera doesn't really know if you want the flash to light up the room or just provide a bit of a "fill in". First thing I would try is dialing in some FEC (Flash Exposure Compensation) - you can dial in up to 2 stops from the camera, or up to 3 stops directly from the flash.

    Also, where the flash is pointing is important - try pointing it upwards, or if you're really keen, think of investing in a Gary Fong Lightsphere.

    Does this help? (just get back to me if I'm talking too fast!)

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    Re: Speedlite 580EX - flash underexposure problem

    PS: If you can, do a test for me. Set the camera to manual - 1/250th of a second, ISO 400, Aperture as wide open as it'll go (F3.5?) - point the flash directly up - and take a shot.

  6. #6

    Re: Speedlite 580EX - flash underexposure problem

    Last edited by Colin Southern; 24th March 2009 at 02:40 AM. Reason: Insert Image Inline

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    Re: Speedlite 580EX - flash underexposure problem

    (Laughing)....Amazing call Colin. Wow!

    Great post Kookeer. More people than you know just learned something.

    Colin

  8. #8

    Re: Speedlite 580EX - flash underexposure problem

    Thank you Colin(s)

    Kookeer

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    Re: Speedlite 580EX - flash underexposure problem

    Quote Originally Posted by Colin O'Regan View Post
    (Laughing)....Amazing call Colin. Wow!

    Great post Kookeer. More people than you know just learned something.
    Nah - I just happen to know Canon EOS flash systems pretty well

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    Re: Speedlite 580EX - flash underexposure problem

    Quote Originally Posted by kookeer View Post
    Thank you Colin(s)

    Kookeer
    No worries. She's looking a bit "over-cooked" now - so just reduce your aperture, ISO or FEC by a stop or two and you should be pretty close (note that changing your shutter-speed won't have any effect on the flash - only the ambient light).

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