[Leica] RE: Which Ultra-Wide, Heliar 15mm or Heliar 12mm

[leica@rakitzis.com]

Henning,

As far as I know quantum mechanics are not necessary for an understanding
of optical diffraction. Sure -- if you want to analyze the motion of
photons as individual particles, you need to use quantum mechanics. But
diffraction was well understood by astronomers well before Schroedinger,
et al. and don't forget in the absence of weird phenomena like the
photoelectric effect light looks a whole lot like waves!!!

I need to think about this for a while. As you might guess, I don't
buy your explanation, I think there's a fallacy. While I look up the
theoretical analysis I'll see if I can also do my own tests. I'd love
to shoot the same object with a long lens and a short lens wide open
and at f22 to see if there's a difference in diffraction losses.

Byron.