Originally posted by falconeye I will not again enter all that equivalent discussion. There's only one correct answer and it has been given already.

Actually, looking at the "White Paper",

there is one aspect of the answer which does not yet seem to have been clarified,

as far as I have been able to find.

You describe the following 4 parameters as fundamental:

Exposure time t, aperture diameter d, field of view FoV, and number #MP of pixels.

Then as I understand equivalence,

you may have two different choices of parameters,

say < t, d, FoV, #MP > and < t', d', FoV', #MP'>,

that are equivalent.

In the "White Paper" and other discussion,

you give examples of equivalence,

but these examples are generally in terms of some scaling c.

However, if I have understood the equivalence idea correctly,

there should be some function C (for "Camera number"),

say C(t, d, FoV, #MP),

such that the two choices < t, d, FoV, #MP > and < t', d', FoV', #MP'>

are equivalent precisely when C(t, d, FoV, #MP) = C(t', d', FoV', #MP').

Are you able to give us such a "camera number" function

that is more general than just involving a scaling c?

I believe that seeing such a "camera number" function

would help people reach a fuller understanding of equivalence.