DOF on micro 4/3rds cameras

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Mr_Sukebe

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Just read some of the GF1 review, which I thought was quite interesting.

Quick question for those in the know.
To my knowledge, DOF is defined by aperture, focal length and distance to target. Just how does the 2:1 crop sensor on 4/3rds cameras like the GF1 affect DOF.

e.g. imagine I'm taking a shot of a person that is say 3m from me using a FF camera with an 85mm lens at F2.0.
Would the DOF be similar to say a GF1 at 3m using a 45mm lens (thus equilvant to a 90mm lens) also at F2.0?

Thanks in advance.
 
A 45mm lens at f2 with a subject distance of 3m will give a DOF of 0.26m on the GF1

A 90mm lens at f2 with a subject distance of 3m will give a DOF of 0.13m on a D3

have a play at www.dofmaster.com
 
When the framing is the same, as in your example, there is two stops more depth of field with 4/3rds format.

It's the f/number x crop factor.

Basically with 4/3rds, if you want to play shallow DoF tricks, well, it's not easy. You need very low f/number lenses to get like for like, such as two stops lower f/number to get the same DoF as full frame, and three-quarters of a stop lower to match Nikon/Canon crop bodies.
 
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