Amateur Photographer Magazine

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Do you have or know of any images where this can be demonstrated clearly? I understand the theory about aperture values on full frame allowing for finer control and shallower DoF but when it comes to differential focus am not sure it's all that clear cut if you take into account the "telephoto effect" smaller formats have.

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Try this DOF calculator - which shows the effect very clearly, adjusting the circle of confusion appropriately for the format of the camera you select.

Whilst the extra DoF with small formats is not likely to be an embarassment when using tele lenses, if you need a combination of wide angle of view and differential focus then a large format has a clear advantage - sure, the angle of view of a 10mm four-thirds format lens is very similar to that of a 20mm full-frame lens, but the depth of focus is not, unless the aperture is opened two full stops.

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