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Thread: SB-600 stop equivalent

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    SB-600 stop equivalent

    Using an SB-600 in manual, what increment of power is equivalent to one stop? For example if I am at 1/4 power, take a picture, then stop down my aperture by one stop, what is the next "stop" on the flash to compensate?
    Nikon D90
    18-105mm f/3.5-5.6G DX VR; 50mm f/1.8; 105mm f/2.5 AI; 70-300mm f/4-5.6G; Sigma 28mm f/1.8
    SB-600



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    Full, 1/2; 1/4; 1/8; 1/16; 1/32--this is commonly referred to as a "five f/stop range" of variable power. Some flashes also offer 1/64 and 1/128 power settings for a seven-stop range.
    "It's about time people started taking photography seriously, and treating it as a hobby." Elliott Erwitt

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    Thanks.
    Nikon D90
    18-105mm f/3.5-5.6G DX VR; 50mm f/1.8; 105mm f/2.5 AI; 70-300mm f/4-5.6G; Sigma 28mm f/1.8
    SB-600

  4. #4
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    Incidentally, Derrel, I'm asking because I'm playing with the 105mm AI you recommended.
    Nikon D90
    18-105mm f/3.5-5.6G DX VR; 50mm f/1.8; 105mm f/2.5 AI; 70-300mm f/4-5.6G; Sigma 28mm f/1.8
    SB-600

  5. #5
    KmH
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    Except lens aperture, divide by 2, or times 2, is a stop.

    ISO 100, to ISO 400 - is 2 stops. 100 x2 = 200 x2 = 400

    Or ISO 1600, to ISO 400 - is 2 stops going the other direction 1600 / 2= 800 /2 = 400

    Shutter speed is the same 1/200, to 1/800 - is 2 stops as is 1/1600, to 1/400.

    For lens aperture the area of a circle (imperfect) is involved, rather than the aperture diameter, and we have to use the square root of 2 instead; 1.4142 to define a full stop. f/2, to f/4, is 2 stops - f/2, f/2.8, f/4.

    Conversely, going the other way f/5.6 is to stops larger than f/11 - F/11, f/8, f/5.6

    I love math!
    Last edited by KmH; 05-11-2011 at 09:53 AM.
    Trever1t and Twisted_Pixel like this.
    . . . . . . Keith . . . . . . .How Do I Use My Digital SLR?...
    Photography is at its core an attempt to represent the reality of light in a media that canít faithfully reproduce it.

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    Wow, thanks KmH. I think I got it. I'm still in the middle of letting it sink in.

    I didn't even notice (until now) flash power worked the same way (x2 /2). Now it makes sense why the flash jumps from 1/2 to to full.
    Nikon D90
    18-105mm f/3.5-5.6G DX VR; 50mm f/1.8; 105mm f/2.5 AI; 70-300mm f/4-5.6G; Sigma 28mm f/1.8
    SB-600

  7. #7
    KmH
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    Since the thread started based on a flash unit, don't forget the Inverse Square Law.

    If you don't change the flash power, the amount of light on a subject is a function of the square of the distance, if the distance is changed.
    If the light is moved twice as far away, only 1/4 as much light hits the subject. If you double the distance again, only 1/16th as much light hits the subject.
    . . . . . . Keith . . . . . . .How Do I Use My Digital SLR?...
    Photography is at its core an attempt to represent the reality of light in a media that canít faithfully reproduce it.

  8. #8
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    Funny that you mention that, I just was re-reading about it. It didn't quite make sense until now. A lot of things have been clicking lately... no pun intended.
    Nikon D90
    18-105mm f/3.5-5.6G DX VR; 50mm f/1.8; 105mm f/2.5 AI; 70-300mm f/4-5.6G; Sigma 28mm f/1.8
    SB-600

 

 

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