SN0327 12.5" f/4.75 (3/4" plate)
OBSIDIAN OPTICS MIRROR TEST SHEET - 1/20/04
Comments: SN0327 Beckett 12.5" f/4.75
Optical diameter: 12.36
Radius of curvature: 119
f/D: 4.81
Diffraction disc: 0.000126856
ZONE 1 2 3 4 5
h(x) 2.5000 3.7700 4.7200 5.5400 6.1800
h(m) 1.2500 3.1350 4.2450 5.1300 5.8600
hm**2/R 0.0131 0.0826 0.1514 0.2212 0.2886
hm/4f 0.0053 0.0132 0.0178 0.0216 0.0246
Diam1 0.1100 0.1780 0.2450 0.3090 0.3850
Diam2 0.1200 0.1780 0.2500 0.3180 0.3930
Diam12 0.1150 0.1780 0.2475 0.3135 0.3890
D12 - 0.0967 0.0183 0.0813 0.1508 0.2168 0.2923
Lamda c 0.0052 -0.0012 -0.0006 -0.0043 0.0038
Lamda f * 1e5 2.74 -1.65 -1.05 -9.29 9.29
Lamda f / rho 0.216 -0.130 -0.083 -0.732 0.732
u * 1E6 -0.46 0.28 0.18 1.56 -1.56
Wavefront -1.28 -1.10 -1.10 0.00 -1.16
Reference parabola: y = 0.0211396 * x**2 + 0
passing through ( 0.00, 0.00) and ( 5.54, 0.00)
Maximum wavefront error = 1 / 16.8 wave at zone 1 (average of measured diams)
Mirror wavefront error <= 1/12.5 wave across both diameters
Polish, diffraction edge, figure of revolution excellent, smoothness very good
Results for individual diameters:
Reading Diam1: 1 / 13.7 lamda, Max Trans Aberration=0.78
Reading Diam2: 1 / 12.4 lamda, Max Trans Aberration=0.69
|