C14 OTA Specifications

Clear Aperture:  14 inches (350mm)
Light grasp(compared to eye with 7mm pupil size):  2,580x
Optical design:  Schmidt-Cassegrain catadioptic; diffraction limited
Focal Ratio:  f/11
Focal length: 154 inches (3,910mm)
Highest useful magnification: 840x
Lowest useful magnification:  50x
Photographic resolution:  182 lines/mm (theoretical at 4100 angstroms)
Closest focus:  100 feet (30.5 meters)
Resolution (Dawes limit):  0.3 arc seconds (diffraction limit)
Stellar magnitude limit:  (visual; approx.) 15
Image scale:  0.37 degrees/inch (=0.014 degrees/mm)
Photographic field of view:  0.35 x 0.51 degrees on 35mm slide film

Primary mirror:
        figure:  spherical
        diameter: 14.25 inches (361.9mm)
        f/ratio:  f/2.14
        radius of curvature:  60 inches (1,524mm)

Secondary mirror:
        figure:  spherical (final hand figuring yields a slightly aspheric figure)
        diameter:  3.50 inches (88.9mm)
        radius of curvature:  17.6 inches (325.1mm)
        amplification ratio:  5.14

Central obstruction:  4.5 inches (10% by area or 32% by diameter)
Corrector plate:  true aspheric Schmidt curve on exterior; plane interior
Thickness of corrector:  1/4 inch
Back focus:  14 inches approx. maximum (from apex of primary)
Mirror coatings:  enhanced aluminum; with silicon monoxide (SIO) protective overcoat
Corrector plate coatings: anti-reflection magnesium fluoride (MgF2); 1/4 wave thickness optimized for 540NM.


Optical tube assembly dimensions (max.):
        width: 16 inches (40.6cm)
        length:  30 inches (76cm)
        weight:  50 lbs. (23 kg)
 

The New Observatory Setup

In the spring of 2006 I constructed a domed observatory on my property in Manchester, MI. The telescope is being used for astrophotograph, photometry and to track minor planets. The observatory can be remotely controlled via the Internet or remote observing room.