think most users do not want to talk about this because they don't see this as a problem,
I think many users don't build in these dimensions. They are not so familiar with the matter.
@Miwarre Your explanations are very complicated for me. I'm a builder, no mathematician, no architect, I'm only
playing with one, and trying to translate it in my language and in my understanding, but I'm trying to help as well as I can do. When I see the pictures
I can imagine it better.
I have the wish for more precision, more measurements, bigger glass size for instance. Who really needs 0,5° differents, if he wants to build no ogival or
absolutely accurate.