The escalation towards the amateur construction of ever more powerful Newtonian Dobsonian reflector telescopes (thanks to parabolic mirror lenses of ever larger diameter trying to contain their weight) it collides head-on with some technical problems that grow exponentially with respect to the benefits provided.
I refer to the following Michael Davis Youtube video that I have seen with interest and attention, also thanks to the “lock-down” impediments, fortunately so far in good health, successive in these times of crown virus, also considering that the English language dialogues of the films, constitute in Italy an obstacle for all willing and maybe scratch glass
The material issue to be taken to build one for telescope mirror is quite fascinating. If you start from a hypothetical initial question (of which we do not know a priori the solution) which is: If you have to build a mirror for a telescope, what material is more convenient to do so? The most obvious answer and obvious that
