Leander McCormick Observatory McCormick 26-inch Refractor Specs
Manufacturers : Alvan Clark and sons
Effective focal ratio : f/14.857
Effective focal length : 391 inches
(1) Crown Glass
- Outer Diameter : 27.2 inches
- Clear Aperture : 26.25 inches
- Curvature radius 1 : 161.39 inches
- Curvature radius 2 : -161.39 inches
- Refractive index at 588 nm : 1.517
- Thickness (central) : 1.884 inches
- Weight : 70 pounds
- Outer Diameter : 27.17 inches
- Clear Aperture : 26.25 inches
- Curvature radius 1 : -162.07 inches
- Curvature radius 2 : -21140 inches
- Refractive index at 588 nm : 1.628
- Thickness (central) : 0.958 inches
- Weight : 110 pounds
- Field Diameter : 5.1 inches (with plates)
- Angular Field : 0.75 degrees (with plates)
- Plate Scale : 20.75 arcsec/mm
