WIYN TECHNICAL SPECIFICATIONS
Optics, General
| Primary Diameter | 3498.85mm (137.75") |
| Primary Focal Ratio | 1.7505 |
| Tertiary Location Above Primary | 475.4mm (18.73") |
| Baffle Diameter | 1446.2mm (56.94") 17.1% |
Official Zemax Model
Primary Mirror
| Blank Diameter | 3511.55mm (138.25") | ||
| Diameter (to bevels) | 3498.85 (137.75") | ||
| Edge Thickness | 463.9mm (18.264") | ||
| Center Hole Diameter | 965.2mm (38") | ||
| Sagitta | 124.92mm (4.918") | ||
| Cass Hole Sagitta | 9.4mm (0.370") | ||
| Glass | Borosilicate | ||
| Mirror Weight | 196Kg (4320lbs) | ||
| Cell Weight | 5854Kg (12,280lbs) | ||
| CG Location | 468mm (18.43") from vertex | ||
| Surface Quality | 0.025 waves rms | ||
| 0.34 waves P-V | |||
| 0.09 arcsec FWHM @ 500nm | |||
| Surface Roughness | 8 Angstrom (average) | ||
Secondary Mirror
| Diameter | 1200mm (47.25") |
| Center Thickness | 156mm (6.142") |
| Glass | Zerodur |
| Weight | 119.5Kg (263lbs) |
| Cell Weight | 110Kg |
| Surface Quality | 0.024 waves rms |
| 0.26 waves P-V | |
| Seconday Roughness | 11.6 Angstroms average |
| Secondary Articulation | |
| Focus Travel | 1.5cm |
| Linear Resolution | 0.125 micron steps |
| Pivot Point Location | 310mm (12.23") above secondary |
| Tilt Resolution | 0.014 arcsec angular image displacement |
| Speed | 1600 steps per second |
| 0.09 arcsec FWHM @ 500nm | |
| Surface Roughness | 8 Angstrom (average) |
Tertiary Mirror
| Ellipse Dimensions | 1101mm x 776mm (43.35" x 30.55") |
| Thickness | 101.6mm (4.00") |
| Weight | 60Kg (132 lbs) |
| Cell Weight | 76Kg (173 lbs) |
| Surface Quality | 0.026 waves rms |
| 0.428 waves P-V | |
| 0.022 arcseconds FWHM | |
| Surface Roughness | Better than 20 Angstroms |
As Built Optical Prescriptions
| Effective Focal Length | 22004.5 |
| Total Track | 4202.87 |
| Image Space F/# | 6.28906 |
| Exit Pupil Diameter | 1361.08 |
| Exit Pupil Position | -8559.89 |
| Back Focal Distance | 2706.81 |
| Plate Scale (On Axis) | 9.372 arcsec/mm |
| Distortion | 0.002% |
| 0.2 degree of axis | |
| Magnification | 3.5915 |
| Field of View | 12 arcmin (aproximate) |
| Wavelength Coverage | Panchromatic |
| Lens Units | Millimeters |
| Surface Radius | Thickness | Glass | Diameter | Conic |
| STO -12253.5 | -4202.869 | MIRROR | 3500 | -1.0708 |
| (2) -5332 | 4202.869 | MIRROR | 1136.592 | -3.74 |
| (3) Infinity | -475.4 | 536.8658 | 0 | |
| (4) Inifinity | 0 | 797.9691 | 0 | |
| (5) Infinity | -3182.21 | MIRROR | 604.2212 | 0 |
| IMA | 0 | 15.653 | 0 |