OK I hate to dredge up this debate again. But after continued research. This is what I have uncovered.
with increased magnification depth of field becomes narrower and narrower.
Meaning a typical photo the the subject in the image is much smaller than what it's actual size is. like a landscape photo. You could have a depth of field from 3m to infinity at f 22
Now take the images above at nearing 1:1 size ratio the max depth of field becomes very narrow. to with in 20cm to 25cm.
If we had the ability with this camera to increase the magnification to 2:1 or even 4:1 we would find the range of depth of field would become even narrower
Jason
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