Narrow DOF on a FF body ?

[Snaperature]

Hey, i'm new here, so i hope i'm putting this in the right place.


I was just looking through a few of the posts already on here, and notice that someone said that on a FF body the DOF is narrower then on a Croped sensor body... Would anyone be able to explain the logic behind this, this seems like an interesting thing which i would love to understand as i am only used to cropped sensor, but i am soon going to be buying the 5D mk II





Thanks.

[clemmb]

For the same focal length in order to fill the frame you will be closer to your subject. This will give you a more shallow DOF.


Mark

[neuroanatomist]

It's true - a crop body gives you an 'effective' focal length of 1.6x longer compared to FF, and an effective aperture of 1.6x smaller (larger f number) when compared to FF, as it applies to depth of field.


If you want a more detailed explanation, see this article:http://www.dofmaster.com/dof_dslr.html.

[Snaperature]

argh... that makes sense.. i was thinking there was more to it, with the way that the light fell onto the sensor etc. but no, yet again a simple answer.