Fan Mountain 31-inch Tinsley Reflector
General System Data: Classical Cassegain system
- Effective focal ratio - f/15.484
- Effective focal length - 480.0 inches
- View Optical layout
(1) Primary Mirror: Parabolic
- Outer Diameter - 32.0 inches
- Inner Diameter - 8.6 inches
- Thickness - 8.0 inches
- Clear Aperture - 31.0 inches
- Focal Length - 120 inches
- Material - ULE
- Reflective coating - Aluminum
(2) Secondary Mirror: Hyperbolic
- Outer Diameter - 8.75 inches
- Thickness - 1.5 inches
- Clear Aperture - 8.50 inches
- Focal length - 70.81 inches
- Material - ULE
- Reflective coating - Aluminum
(3) Focal Plane: Cassegrain focus
- Field Diameter - 5.5 inches
- Angular Field Diameter - 39.4 arcmin
- Plate Scale - 16.92 arcsec/mm
A
ZEMAX lens file for the 31-inch is available.
It was created using ZEMAX version 8.0. This file can be saved in text
format and read directly into ZEMAX for further analysis.
