The other type of telescope used on the astronomy night was a Newtonian Reflector. I used to teach the advantages and disadvantages of the Cassegrain Reflector but I've had to look this one up. With the Cassegrain, you look in at the bottom of the telescope along the axis. With this, you look in at the side near the top. A concave mirror focuses the light near the top and it is reflected sideways by an angled plane mirror. The lack of lenses means no chromatic aberration. The Newtonian only has one mirror that needs shaping unlike two in the Cassegrain.
