DOF in low light

[Daniel_Linner]

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. :)

[Ockie]

http://www.cambridgeincolour.com/tutorials/depth-of-field.htm#calculator
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.

[Daniel_Linner]

Okay, thanks for the answer mate!

Hmm, interesting site! Is the calculator reliable?

[Ockie]

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?

[Mark_Cohran]

http://www.cambridgeincolour.com/tutorials/depth-of-field.htm#calculator
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_Cohran]

This is the DOF calculator most of us use:

http://www.dofmaster.com/dofjs.html