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RE the appreciably greater DoF; any chance of some pictures that show the effect in practice?

Should be easy to show the difference between large format and a digital compact but I don't expect the differences between APS-C and 4/3rds to be that great. I think it's more a theoretical advantage than a practical one that can be demonstrated.

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Actually, I gleaned this information from "All About Using a Miniature" published by Focal Press, 1956! I agree the difference between APS-c and 4/3rds is likely to be small as APS-c is itself a slightly miniaturised format.

Yes it would be good to explore this. Presumably you want a picture with a wide aperture, where DOF can easily be assessed? (e.g. down the side of some railings?) I'll try to do something to put up. Which lens; standard zoom?