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The following are the Foucault test readings on my 6 inch f/4.9 mirror. Measurements are in inches. Readings are an average of six values.
| Zone | Inner Radius | Outer Radius | Effective Radius | Ideal | Ideal Delta | Reading | Reading Delta | % Zonal Correction |
|---|---|---|---|---|---|---|---|---|
| 1 | 0.00 | 1.50 | 0.919 | 0.000 | 0.673 | |||
| 2 | 1.50 | 2.12 | 1.824 | 0.021 | 0.021 | 0.692 | 0.019 | 90% |
| 3 | 2.12 | 2.60 | 2.366 | 0.040 | 0.019 | 0.712 | 0.021 | 107% |
| 4 | 2.60 | 3.00 | 2.803 | 0.059 | 0.019 | 0.729 | 0.017 | 88% |
According to FigureXP, the peak to valley wavefront error is 1/23 wave, and the Strehl ratio is 0.995.
The following is a knife edge photo, with the knife approaching from the right.
Below is a Ronchigram outside of focus.
