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Thread started 12 Aug 2008 (Tuesday) 13:39
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DOF in low light

 
Daniel_Linner
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Aug 12, 2008 13:39 |  #1

I am quite new in photographing and when I was at work today I started wondering about a thing. Is the depth of field depending only on the aperture size and the focusing point, or has the lighting anything to do with it also? Is the DOF same in low light as in normal light with the same aperture size? Please enlighten me and improve my understanding about DOF. :)




  
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Ockie
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Aug 12, 2008 13:54 |  #2

http://www.cambridgein​colour.com …h-of-field.htm#calculator (external link)
that links seems pretty decent.
And well, more light will need a faster shutter if you keep the aperture the same, so at some point the shutter speed needed might be faster than whats available...(assuming you are already on the lowest ISO).

Coming back to your question: DOF is theoretically the same with much or little light, keeping the same aperture.


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“It is not our part to master all the tides of the world, but to do what is in us for the succour of those years wherein we are set, uprooting the evil in the fields that we know, so that those who live after may have clean earth to till. What weather they shall have is not ours to rule.”

  
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Daniel_Linner
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Aug 12, 2008 14:58 |  #3

Okay, thanks for the answer mate!

Hmm, interesting site! Is the calculator reliable?




  
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Ockie
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Aug 12, 2008 15:11 |  #4

Daniel_Linner wrote in post #6094560 (external link)
Okay, thanks for the answer mate!

Hmm, interesting site! Is the calculator reliable?

hmm, don't think so, at least for high distances from the camera it isn't, as from around 10 feet forwards my 50mm lens focuses the same for 20 feet as for 200 feet, thus not having any OOF from, lets say 25 feet backward and 35 feet forward...
did i just make a total mess of that sentence?


Website (external link)500px (external link)

“It is not our part to master all the tides of the world, but to do what is in us for the succour of those years wherein we are set, uprooting the evil in the fields that we know, so that those who live after may have clean earth to till. What weather they shall have is not ours to rule.”

  
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Mark_Cohran
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Aug 12, 2008 17:03 |  #5

Ockie wrote in post #6094191 (external link)
http://www.cambridgein​colour.com …h-of-field.htm#calculator (external link)
that links seems pretty decent.
And well, more light will need a faster shutter if you keep the aperture the same, so at some point the shutter speed needed might be faster than whats available...(assuming you are already on the lowest ISO).

Coming back to your question: DOF is theoretically the same with much or little light, keeping the same aperture.

For a given aperture, subject distance, sensor size and focal length, DOF will be the same regardless of the lighting conditions.


Mark
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Mark_Cohran
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Aug 12, 2008 17:04 |  #6

This is the DOF calculator most of us use:

http://www.dofmaster.c​om/dofjs.html (external link)


Mark
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Some primes, some zooms, some Ls, some bodies and they all play nice together.
Forty years of shooting and still learning.
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DOF in low light
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