I am setting a very precise portrait brief for 5x4 and would like to open it up to other formats whilst retaining the same dof.
Is there a chart or formula somewhere to calculat what aperture would correlate 150mm and f16 on 5x4 with 50mm on 35mm format? I am guessing f8 ish.
I would need to do the same with MF and dx/apsc formats-- 10x8 too come to think of it
Thank you for your help