SN0312 12.5" f/6.7 (2.16" Pyrex)

      	
		OBSIDIAN OPTICS MIRROR TEST SHEET - 2/18/04

           Comments: SN0312 Mortley 12.5" f/6.6
   Optical diameter: 12.4
Radius of curvature: 166.66
                f/D:  6.72
   Diffraction disc: 0.00017709

	ZONE                1          2          3          4          5      
	h(x)              2.5000     3.7700     4.7200     5.5400     6.2000
	h(m)              1.2500     3.1350     4.2450     5.1300     5.8700
	hm**2/R           0.0094     0.0590     0.1081     0.1579     0.2067
	hm/4f             0.0038     0.0094     0.0127     0.0154     0.0176
	Diam1             0.1220     0.1733     0.2213     0.2697     0.3163
	Diam2             0.0934     0.1546     0.1962     0.2460     0.2918
	Diam12            0.1077     0.1639     0.2087     0.2579     0.3041
	D12 -  0.1000     0.0077     0.0640     0.1088     0.1579     0.2041
	Lambda c         -0.0016     0.0050     0.0007    -0.0000    -0.0027
	Lambda f * 1e5     -0.62       4.71       0.83      -0.05      -4.71
	Lambda f / rho    -0.035      0.266      0.047     -0.003     -0.266
	u * 1E6             0.07      -0.56      -0.10       0.01       0.56
	Wavefront           0.00      -0.61      -0.60      -0.48       0.00
	Reference parabola: y = -0.0135071 * x**2 + 0.269873
	passing through (  2.50,  0.00) and (  6.20,  0.00)

Mirror wavefront error <= 1/20th wave across both diameters

Polish, diffraction edge excellent; figure of revolution, smoothness very fine.

Arithmetic wavefront error = 1 / 35.4 wave at zone 2 (averaged both diameters)

Results for individual diameters:
	Diameter1: 1 / 47.2 lambda, Max Trans Aberration=0.17
	Diameter2: 1 / 23.5 lambda, Max Trans Aberration=0.37
 
 

© 2004 Obsidian Optics