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Thread: Just need to confirm my thinking:::

  1. #1
    Ausphotography Regular
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    Just need to confirm my thinking:::

    If I am stacking 2 x flashlights together...

    I did NOT extended it's effective distance.

    I ONLY double amount of light illuminate to my subject. (Which means my subject is 2 x brighter)

    Looking forward to you answer

  2. #2
    Account Closed Wayne's Avatar
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    Yes, assuming both lights are =

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    Yep, same setting everything. Same model of light too.

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    Arch-Σigmoid Ausphotography Regular ameerat42's Avatar
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    And, if they are of equal output, your exposure is increased by only 1 f-stop, though... Am.
    CC, Image editing OK.

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    Oh! really? Damn, I thought it's more than that

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    Arch-Σigmoid Ausphotography Regular ameerat42's Avatar
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    Nope! N times the light/area of glass/aperture = sqrt of N increase in exposure. (This is the BRIGHT side, if you had 3 equival flashes you'd only 1.7 times the exposure. So you'd need 4 equiv flashes to get an increase of 2 f-stops.) Inverse square law for light intensity.
    Am.

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    very useful response Ameerat42
    William

    www.longshots.com.au

    I am the PhotoWatchDog

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