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Yes but your avoiding the facts.
Most people go on about M4/3 not giving you as much shallow dof, it will and it will give you tighter control using the same lens.
But most people will compare say a 25mm M4/3 lens against say a 50mm lens on full frame, and of course doing this the dof with a M4/3 lens will be greater and for obvious reasons.
If you used a 50mm lens on both a Full Frame camera and a crop sensor with the same aperture taking a photo of the same object from the same distance, say a 5D and a 50D, then exactly the same things would be in focus exactly the same amount on both cameras.
The difference would be the cropped camera would only have stored the central part of the image as it's sensor is smaller and would have missed the bits round the edge that the Full Frame sensor would have captured.
If in a real world scenario you wanted to take the same photo of the same object with the same aperture from the same place with both cameras you would need to use different focal length lenses. You would keep the 50mm lens on the cropped camera, but need an 80mm lens on the Full Frame camera.
Now there is a difference in the Depth of Field produced by both cameras caused by the fact that in order to get the same photo on the Full Frame camera you have had to use a longer lens, the longer lens reduces the Depth of Field so less of the shot will be in focus.
What will be very slightly larger ?
From that check I did the full frame camera with a 50mm had a depth of field that was more or less doubled, hardly slight.
The most radical effect on DOF is caused by subject distance, not lens focal length; the real-world effect of any crop factor is that you're always likely to be further away from the subject for any given composition. In switching between a 40D and 5D with an existing set of lenses, that might be pertinent.
Quote: The most radical effect on DOF is caused by subject distance, not lens focal length
Yes your right, but people get there facts mixed up and assume dof is greater using a crop sensor, when using the same lens and at the same distance.
This is a good example, B&W pictures at the bottom.
http://betterfamilyphotos.blogspot.co.uk/2013/01/olympus-om-d-first-impressions-...
Quote: Yes your right, but people get there facts mixed up and assume dof is greater using a crop sensor, when using the same lens and at the same distance.
Nobody's disputing that. But if you used a 100mm lens on a 5D for the same field of view, you would need a 62.5mm lens on a 40D. That would give you slighter higher DOF than 100mm on the 5D.
Quote: And the link you linked to proves it perfectly
Yes it does 
Quote: The FF picture @ f/1.4 displays crazy thin DOF, not possible at all with m4/3
Not good at all is it, much more control using a 25mm at F1.4, crops give you more dof control in low light
Might be good if you wanted to isolate a street sign against a busy background, but that full frame dof is pretty useless for a portrait in low light unless you raise the ISO to use a smaller aperture, more dof is more control
Crop DSLR`s have there advantages.
Stick with the 40D
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