I wasn't clear obviously. What I meant is this: if you have the aperture ring with the LM scale uppermost and you choose to operate this way, it's inconvenient to pre-visualise the resultant picture by scale numbers. Far better to think in terms of f stops. Imagine using a RF with a LM scale in place of f numbers. Yes I know you can do dof preview on the Pen Fx, but some of us like to pre-visualise, mainly because we use a RF as well and that's how we've trained ourselves.