Fan Mountain 40-inch Astrometric Reflector
General System Data: Baker system
- Effective focal ratio - f/13.534
- Effective focal length - 541.3764 inches
- View Optical layout
(1) Corrector Lens: aspheric-plano
- Outer Diameter - 43.5 inches
- Thickness - 1.131 inches
- Clear Aperture - 40 inches
- Material - UBK-7
(2) Primary Mirror: aspheric
- Outer Diameter - 43.5 inches
- Inner Diameter - 14.0 inches
- Thickness - 7 inches
- Clear Aperture - 43.060 inches
- Radius of Curvature - 651.64 inches
- Material - ULE
- Reflective coating - Aluminum
(3) Secondary Mirror: aspheric
- Outer Diameter - 19.25 inches
- Thickness - 2.5 inches
- Clear Aperture - 19.00 inches
- Radius of Curvature - 651.64 inches
- Material - ULE
- Reflective coating - Aluminum
(4) Focal Plane: Cassegrain focus
- Field Diameter - 8 inches
- Angular Field Diameter - 50.8 arcmin
- Plate Scale - 15.000 arcsec/mm
A
ZEMAX lens file for the 40-inch is available.
It is at present, however, only an approximation of the actual optical layout.
It was created using ZEMAX version 8.0. This file can be saved in text
format and read directly into ZEMAX for further analysis.
