Newtonian RayTrace and Collimation

See instructions below.

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Starlight: (yellow) shows the light of a star passing through the OTA to the eyepiece. The star can be moved to simulate a star at the edge of the field or the center for checking secondary size.

Eyepiece: simulates basic telescope alignment and shows the eyepiece axis (green) and the primary axis (blue).

Laser: shows how a laser can be used to collimate. Good collimation requires the laser to fold back upon itself.

Cheshire: show how a cheshire works. Both the ray-trace and the Cheshire view are shown.

John W Reed, Created with GeoGebra