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[ATM] Which stroke ?
Hello,
I am currently figuring an 8" f/6.3 mirror. This mirror belongs to my
astronomy club. It was ground and polished 15 years ago but never figured, so
I decided to finish it to replace another telescope that was stolen from the
club last year. I've come to a point where I don't know what to do to improve
the figure. The output from tex is below.
In my opinion I have a high zone that lies in the second and third zones. Is
this correct ? How to correct that ?
Thanks for your help.
TEXEREAU MIRROR TEST SHEET
Comments: T200 de la 4A Optical diameter: 203
Readings per zone: 1
Radius of curvature: 2520
f/D: 6.21
Diffraction disc: 0.00415498
1 ZONE 1 2 3 4 5
2 h(x) 47.0000 65.0000 79.0000 91.0000 101.5000
3 h(m) 31.0000 56.0000 72.0000 85.0000 96.2500
4 hm**2/R 0.3813 1.2444 2.0571 2.8671 3.6762
5 hm/4f 0.0062 0.0111 0.0143 0.0169 0.0191
6 D1 1.8200 3.4400 4.3400 4.8600 5.2800
7 D2 1.8200 3.4400 4.3400 4.8600 5.2800
8 D12 1.8200 3.4400 4.3400 4.8600 5.2800
9 D12 - 1.8944 -0.0744 1.5456 2.4456 2.9656 3.3856
10 Lamda c -0.4557 0.3012 0.3885 0.0986 -0.2906
11 Lamda f * 1e5 -280.31 334.64 554.96 166.21 -554.96
12 Lamda f / rho -0.675 0.805 1.336 0.400 -1.336
13 u * 1E6 2.22 -2.66 -4.40 -1.32 4.40
14 Wavefront 84.52 50.25 2.13 0.00 59.82
Reference parabola: y = -0.00671638 * x**2 + 1.51119
passing through ( 15.00, -0.00) and ( 91.00, 0.00)
Maximum wavefront error = 1 / 6.5 wave at zone 1
--
Eric Royer,
http://www.astrosurf.com/eroyer/
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