Quote:
Originally Posted by JA
....... if you could count the number of photons delivered to the sensor, will NOT be.
YES of course, in this example it is physically ALWAYS a 35mm focal length lens, it's just that it behaves differently on a APSc sized sensor compared to the Full-frame sensor for which it was designed.
Best
JA
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JA, total number of photons delivered to the sensor (as a whole) is irrelevant for exposure time etc... what is relevant is photon flux per pixel (or flux per mm^2) and that will be the same for the same lens (including f/ number).
ONLY difference with different sensor size will be the field of view.