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
 
 

© 2004 Obsidian Optics