In my previous article, I discussed the impact of designing glass elements into phone camera lenses. Here I’ll look at another phone lens conundrum, that of ‘telephoto’ lenses.
Again, we start with the absolute limit on a lens’s resolution capability, which is the diffraction limit provided by the 5mm entrance pupil (aperture) diameter, that’s dictated by the slimness requirements of a phone. The angular resolution limit of 0.008° is calculated