f/1.8 on m4/3, ASP-C, FF; are they the same?

Started Nov 1, 2010 | Discussions thread
gk_uk
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Re: f/1.8 on m4/3, ASP-C, FF; are they the same?
In reply to jpzundel, Nov 3, 2010

No, the DOF of a 20mm f/1.7 on µ4/3 is the same as the DOF of a 40mm f/3.4 on 35mm for the same subject magnification.

As far as depth of field is concerned, to get the same DOF as a FF lens with matching subject magnification, a µ4/3 lens requires two stops wider aperture.

To put it another way, the DOF of µ4/3 is greater because it is a small sensor size.

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