E.g 14mm f/4 in 4/3 vs 28mm f/8 in 35mm.The last is my rule of thumb, doubling focal length and f-stop for equal FOV and equal DOF (and equal diffraction effects.)Hopefully we will not now return to debating whether it is more reasonable to compare images with completely different field of view from the different formats, or to compare crops to equally sized portions of the differently sized senso