How much more depth of field does Micro Four Thirds have than full frame?
Framing the same shot at f/2.8 and 5 meters, Micro Four Thirds produces roughly 3.58 meters of total depth of field against full frame's roughly 1.64 meters at its own equivalent focal length — Micro Four Thirds comes out to roughly 2.2 times more forgiving, using the format's clean 2.0x crop factor to match the framing.
Why the Multiplier Isn't Simply 2.0x
It's tempting to assume the depth-of-field ratio matches the crop factor exactly, but the relationship isn't linear — Micro Four Thirds needs a shorter real focal length (roughly 25mm against full frame's 50mm for this framing) to match the shot, and that shorter focal length widens depth of field through the hyperfocal formula's f² term, not through a simple 1:1 scaling with crop factor. The actual ratio depends on the specific focal length and distance involved, not a single fixed number across every scenario.
Why This Is the Popular, Correct Version of the Comparison
This matched-framing comparison is the one that corresponds to real shooting — a photographer choosing between systems picks whichever real focal length reproduces the composition they want on each camera, not the identical focal length number regardless of the resulting field of view. At the identical real focal length instead, the relationship reverses entirely: Micro Four Thirds' stricter circle of confusion actually gives it less depth of field than full frame, not more, since that comparison isn't accounting for the focal-length difference matched framing requires.
See this exact comparison at your own subject distance and aperture using the DoF & Hyperfocal Calculator, pre-filled with the Micro Four Thirds equivalent.
Frequently Asked Questions
Does the depth-of-field ratio between formats stay the same at every aperture?
Roughly similar in proportion across a range of typical apertures, but not perfectly fixed — the exact ratio shifts slightly with aperture and distance because of the hyperfocal formula's nonlinear terms, so it's worth checking your specific settings rather than assuming one ratio applies universally.
Is Micro Four Thirds' more forgiving depth of field always an advantage?
It depends on the shot — genuinely helpful for run-and-gun documentary and travel work where more of the frame reading sharp matters, but a real limitation for portrait and product photographers specifically chasing the shallowest, most separated background blur possible.