I love this. I think I'll call it Thierry's Theory: "Infinity has no end, but we know where it starts."Victor,
That's true, that infinity is not a measurable distance, and that's why Alpa gives a infinity distance = 20 x Focal Length in Meters. That's the minimum which should be taken for infinity, when calibrating the back.
I have seen photographers using simply the focal length in meters.
Thierry
:thumbup:
Made my day!! Thank you Thierry!