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I'm trying to achieve maximum depth of field without sacrificing light. I have a micro-4/3rds camera and i want to attach a full frame lens to it for the large and constant aperture. My question is, will the depth of field be increased in this case, compared to the lens on a full frame camera with the same aperture?

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Assuming the same print size and effectively the same resolution, yes. But this isn't magic — it's the exact same increase you'd get by shooting with the same lens on full-frame and cropping by the corresponding amount.

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    There will also be no benefit of using a full-frame lens over using a lens with the same aperture designed for micro-4/3rds. – mattdm Sep 11 '11 at 1:51
  • I don't understand this answer - a crop of a picture does not alter the DOF, unless you mean physical "cropping" by moving the camera or zooming? – Console Jan 8 '12 at 16:36
  • @Console: no, I mean literal cropping. But this only applies assuming you view or print at the same size. – mattdm Jan 8 '12 at 16:51
  • Thanks for commenting Matt. I consider DOF to be simply the distance between the closest and furthest part of the subject that are sharp, and this doesn't change when cropping the final image. I guess there could be a perceived difference depending on the resolution of the sensor, but a smaller sensor can have more pixels than a large one so in that case it's not actually related to the size of the sensor, is it? If you could elaborate a little or give a pointer to more information I'd appreciate it, but I realise this is an old question. – Console Jan 8 '12 at 21:59
  • @Console: take a look at this answer and the Wikipedia article it links to, and also at the math-heavy second section of this answer. – mattdm Jan 9 '12 at 0:57

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