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Greyhawk
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06-09-07, 06:15 PM
#1

Depth of Field (DoF)

Depth of field can be manipulated to give different effects. With a shallow DoF (f2.0 for example) only part of your image will be sharp, whilst the rest will be blurred. By increasing the f-Number (see here for an explanation on Aperture) you can bring more of the shot into focus. The diagram below is a very simple representation of how the Aperture affects the DoF:


Not to scale

The purple circle represents you (the photographer) and the lilac oval is the object you are photographing. The red lines represent how much of the foreground/background is in focus depending on what Aperture is used.
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06-09-07, 08:26 PM
#2

Re: Depth of Field (DoF)

Thanks for that explanation a lot easier to understand than the books.
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06-09-07, 09:39 PM
#3

Re: Depth of Field (DoF)

Thanks GH! Added to sticky!
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06-09-08, 08:18 PM
#4

Re: Depth of Field (DoF)

The explanation is clear, but it fails to mention a couple of things.


1. Depth of field is also affected by a couple of other factors.

(i) The closer you are to an object, the narrower the depth of field gets.
(ii) The length of the lens affects the Depth of Field. The shorter the lens, the deeper the DoF

The amout of 'Depth of Field' you get is therefore determined by a product of..

1. Aperture
2. Distance from object.
3. Lens Length.


2. The amount of DoF is not necessarily equally proportioned to front and rear of the object.

On a shorter lens, you will have much more DoF 'behind' the point of focus, than in front (say 2/3 behind, 1/50 in front) where as on longer lenses this will change to 50/50 (on say a 400mm lens)

Alan.
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