SN0311 12.5" f/5.4 (1.52" plate)
Obsidian Optics Mirror Test - 2/28/04
Comments: SN0311 Cushnie 12.5" F/5.4
Optical diameter: 12.36
Radius of curvature: 134.88
f/D: 5.46
Diffraction disc: 0.000143785
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 0.0116 0.0729 0.1336 0.1951 0.2546
hm/4f 0.0046 0.0116 0.0157 0.0190 0.0217
Diam1 0.0535 0.1145 0.1730 0.2430 0.2915
Diam2 0.1270 0.1855 0.2485 0.3175 0.3660
Diam12 0.0902 0.1500 0.2107 0.2802 0.3287
D12 - 0.0793 0.0110 0.0707 0.1315 0.2010 0.2495
Lamda c -0.0006 -0.0021 -0.0021 0.0059 -0.0051
Lamda f * 1e5 -0.29 -2.50 -3.35 11.13 -11.13
Lamda f / rho -0.020 -0.174 -0.233 0.774 -0.774
u * 1E6 0.04 0.37 0.50 -1.65 1.65
Wavefront 0.17 0.72 1.27 0.00 1.13
Mirror wavefront error <= 1/15th wave across both diameters
Polish, diffraction edge, figure of revolution, and smoothness all excellent.
Arithmetic wavefront error = 1 / 17.0 wave at zone 3 (averaged both diameters)
Results for individual diameters:
Reading Diam1-1: 1 / 23.4 lambda, Max Trans Aberration=0.60
Reading Diam1-2: 1 / 14.4 lambda, Max Trans Aberration=0.95
Reading Diam2-1: 1 / 16.5 lambda, Max Trans Aberration=0.81
Reading Diam2-2: 1 / 14.5 lambda, Max Trans Aberration=0.74
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