Personal Sense of Scale by Jesse Rogerson|Published 19 February 2014|1 comment This provides a much needed sense of scale when looking at the Bok 2.3m telescope. That’s 2.3 meters, or 230 centimeters…which means the primary mirror on the Bok telescope is larger in diameter than I am tall. I could lay down comfortably on the mirror and fit easily (…but I won’t do that…). We have the telescope tipped over to (almost) its limit in order to flll the camera up with liquid nitrogen (the camera is that big black thing inside the black ring). Also in the picture is the mirror cover, the pyramid-like structure right next to me.