[Brightcolours]

if the diagrams have common data (these are just 2d axis diagrams) and same values then maths do allow comparison.

They don't seem logarithmic or differential. so it is fairly straightforward; with matlab we could even reverse engineer the equation they have derived from and compare the variables and the exponents from each lens. since maths is common for optical physics nobody could object derived data :-)

 

when you want to compare two results the best way in physics is to compare the two plots and interpolate the results. And if x-axis is contrast and y-axis is frequency for a specific measurable entity, why not?

The x-axis is about the distance from the optical axis, isn't it?

im talking physics here. and optical engineering is about exponential equations.