2-Plane Telescope - My design uses the primary mirror to focus light in the X-plane. The secondary focuses the Y-plane. The advantages are many. Grinding glass in 2 dimensions is exponentially easier than the traditional parabolic method on a circular blank so it is far more economical . For example, a 24-inch objective in my system would have the resolution of a 24-inch mirror, cost less to produce and weight as much as an 8-inch mirror, and have the light gathering power of a 12-inch objective!