Mirror Type Add Aperture Diaphragm
Mirror Diameter               [mm]
Mirror Focal Length         [mm]
Back Working Distance    [mm]
Half Field Angle               [deg.]  

*   Use Aperture diaphragm in conunction with spherical mirror only
**  The Aperture diaphragm is located at the radius of curvature to eliminate coma
*** This Calculator is based on Jean Texereau book, "How to Make a Telescope"