Recent content by DrCy

Thank you very much! When I said 4 cm and 5 cm, I was referring to the diameter, but I am pretty sure I know what to from here anyway.

Hi. I am new to PF. I am an incoming high schooler with an interest in astrophysics, and a friend and myself are working on building a telescope (not a very sophisticated one, just one that can reveal the craters of the moon and the satellites of Jupiter). I am curious to know if any amateur (or...