Hayo Baan

Hi Georges, The origin of the number is the lens itself – it's what it reports to the camera – and is defined by the physics of the lens; it's design does not let it focus further than that (at least that's how I read it). Also, these numbers can not be taken as absolute truths at all. Fabrication differences (even within tolerances), temperature, etc. all make the numbers indicative at best. Note: I don't know how on the mark above statements are. They are simply built on logical reasoning and some...

Hi Georges, The numbers exiftool returns are simply what the camera (and lens) reports in the metadata. And as Phil already pointed out, “infinity” isn't the same for all lenses. For this lens, it looks like infinity is actually 21.13 meter (focus distance in both cases is 21.13m). The numbers for depth of field and hyperfocal distance are calculated values, based on the focus distance, circle of confusion, aperture and are purely theoretical values. Does this help in understanding what's going on?...