Now you’re comparing different sensor/negative sizes against each other. Usually ”full frame” (aka 135mm) diffraction starts to affect on smaller f-values (larg

Now you’re comparing different sensor/negative sizes against each other. Usually ”full frame” (aka 135mm) diffraction starts to affect on smaller f-values (larger aperture) but on larger negative sizes the diffraction starts to be a problem on bigger F-numbers (smaller apertures). On 4x5 format something like f/22 and on 8x10 f/45.