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Thread: Controlling Flash in strong backlit situation

  1. #1

    Default Controlling Flash in strong backlit situation

    How do one control or uses their flash on their dark subject in strong backlit situation? You do not want to overexpose the already-bright background but neither you want to underexpose your already-dark subject.

    What should be the correct approach? Please share.

  2. #2
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    Default Re: Controlling Flash in strong backlit situation

    Quote Originally Posted by canongrapherL
    How do one control or uses their flash on their dark subject in strong backlit situation? You do not want to overexpose the already-bright background but neither you want to underexpose your already-dark subject.

    What should be the correct approach? Please share.
    what do you mean by control/use the flash? your question is very vague for me ...

  3. #3
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    Default Re: Controlling Flash in strong backlit situation

    Quote Originally Posted by canongrapherL
    How do one control or uses their flash on their dark subject in strong backlit situation? You do not want to overexpose the already-bright background but neither you want to underexpose your already-dark subject.

    What should be the correct approach? Please share.
    use HSS, then point your flash head directly at subject, spot meter on the subject, and shoot.

    but den if i was the one shooting, there its another story altogether, mine need to chut pattern 1... hahah... cos i need trial & error, i dun like direct light. find out your own style...
    Logging Off. "You have 2,631 messages stored, of a total 400 allowed." don't PM me.

  4. #4

    Default Re: Controlling Flash in strong backlit situation

    Quote Originally Posted by canongrapherL
    How do one control or uses their flash on their dark subject in strong backlit situation? You do not want to overexpose the already-bright background but neither you want to underexpose your already-dark subject.

    What should be the correct approach? Please share.
    take 2 shots in RAW and then use HDR in CS2 to get correct exposures for both foreground and background

  5. #5

    Default Re: Controlling Flash in strong backlit situation

    Pardon me, what is HDR?

    Any techniques to take photos without having to photoshop?

  6. #6

    Default Re: Controlling Flash in strong backlit situation

    Set your flash to Manual, and maximum output.
    Set to Tv mode, at your cam's fastest sync speed, usually 1/250s.
    -1 EV on your cam.
    ISO does not really matter as long as your aperture is able to handle the situation. i.e.: not at your highest F-number. if it is, dial down ISO.

    Aim and make sure is focused at your subject.
    Fire away.
    Preview, adjust flash output as necessary.

  7. #7

    Default Re: Controlling Flash in strong backlit situation

    i just shot an event today & every shot was against the sun. my style is high shutter/small aperture. bokeh isn't stunning but its still there...with no overexposure.

  8. #8

    Default Re: Controlling Flash in strong backlit situation

    wont 1/250 overexpose the background if it is really strong sunlight?



    Quote Originally Posted by AReality
    Set your flash to Manual, and maximum output.
    Set to Tv mode, at your cam's fastest sync speed, usually 1/250s.
    -1 EV on your cam.
    ISO does not really matter as long as your aperture is able to handle the situation. i.e.: not at your highest F-number. if it is, dial down ISO.

    Aim and make sure is focused at your subject.
    Fire away.
    Preview, adjust flash output as necessary.

  9. #9

    Default Re: Controlling Flash in strong backlit situation

    wont 1/250 overexpose the background if it is really strong sunlight?



    Quote Originally Posted by AReality
    Set your flash to Manual, and maximum output.
    Set to Tv mode, at your cam's fastest sync speed, usually 1/250s.
    -1 EV on your cam.
    ISO does not really matter as long as your aperture is able to handle the situation. i.e.: not at your highest F-number. if it is, dial down ISO.

    Aim and make sure is focused at your subject.
    Fire away.
    Preview, adjust flash output as necessary.

  10. #10

    Default Re: Controlling Flash in strong backlit situation

    Quote Originally Posted by canongrapherL
    wont 1/250 overexpose the background if it is really strong sunlight?
    there's no way your itsybitsy flash can be more powerful than the sun.

    There's always the option of reflector + strobe combi if you really want.
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  11. #11
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    Default Re: Controlling Flash in strong backlit situation

    there's this guy on the internet who has a website that talks about the use of flash extensively with a number of great real-life experience stories. he is a portrait photographer (often doing location work) and he has a few techniques that helped me tremendously. take a look at his website at http://www.dg28.com/technique.html. i think you'll find your answers there.

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    Default Re: Controlling Flash in strong backlit situation

    My example of strong backlight



    Setting

    Focal Length: 70mm
    Exposure Mode: Aperture Priority
    Metering Mode: Multi-Pattern
    1/180 sec - F/2.8
    Exposure Comp.: 0 EV
    Sensitivity: ISO 100
    Optimize Image: Normal
    White Balance: Auto
    AF Mode: AF-S
    Flash Sync Mode: Front Curtain
    Auto Flash Mode: Built-in TTL
    Auto Flash Comp: -3.0 EV
    Second Flash: -0.7 EV
    Color Mode: Mode I (sRGB)
    Tone Comp.: Auto
    Hue Adjustment: 0
    Saturation: Auto
    Sharpening: Auto
    Image Comment: copyright(C)glenn
    Long Exposure NR: Off
    High ISO NR: Off

  13. #13
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    Default Re: Controlling Flash in strong backlit situation

    assuming u r a canon user, setting P n centre weighted metering,-

    aim at the bright spot,
    press FEL, focus n recompose,
    shoot.
    that's it,
    use a lower iso too would help unless its night scene.

    jude

  14. #14

    Default Re: Controlling Flash in strong backlit situation

    Quote Originally Posted by CYRN
    there's no way your itsybitsy flash can be more powerful than the sun.

    There's always the option of reflector + strobe combi if you really want.
    haha. You got me wrong.

    Let describe the situation again. When you meter at the strong background of the sky, the meter says "1/2000" but when you meter your subject in front of the sky, it says "1/250". THEREfore, if I shoot at the shutter speed of "1/250" this shutter speed will be too long for the background and thus overexpose the strongly lit sky (Though the subject is correctly exposed). BUT if I shoot at "1/2000", my backlit subject will be underexposed so some flash is necessary (But TTL will be fooled by the sun so need manual flash control)

    So there should be a methodological approach to caculate the the right shutter speed and flash manipulation in order to correctly expose both background and foreground subjects. I am surprised nobody seems to be able to describe the approach yet.
    Last edited by canongrapherL; 22nd August 2006 at 02:13 PM.

  15. #15

    Default Re: Controlling Flash in strong backlit situation

    Quote Originally Posted by canongrapherL
    haha. You got me wrong.

    Let describe the situation again. When you meter at the strong background of the sky, the meter says "1/2000" but when you meter your subject in front of the sky, it says "1/250". THEREfore, if I shoot at the shutter speed of "1/250" this shutter speed will be too long for the background and thus overexpose the strongly lit sky (Though the subject is correctly exposed). BUT if I shoot at "1/2000", my backlit subject will be underexposed so some flash is necessary (But TTL will be fooled by the sun so need manual flash control)

    So there should be a methodological approach to caculate the the right shutter speed and flash manipulation in order to correctly expose both background and foreground subjects. I am surprised nobody seems to be able to describe the approach yet.
    oic... normally ppl use ND filters loh.

    Else use the FP thingy, common in flashes nowadays, and shoot @ 1/2000. Cuz if you dun use the FP thingy, you'd be stuck @ 1/200 or 1/250 anyway.

    For calculation between subject and BG... depends on the contrast between them loh...if beyond sensor's DR no matter how also cannot loh.
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  16. #16

    Default Re: Controlling Flash in strong backlit situation

    Quote Originally Posted by CYRN
    there's no way your itsybitsy flash can be more powerful than the sun.

    There's always the option of reflector + strobe combi if you really want.
    It depends... the other way to have a stronger flash is to move closer to the subject... you might have to use a wider lens though..

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