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The telescopes now at 2.5 wave defocused (+/-). Now the light/dark patterns are differening a lot more. The overal pattern is alike but the distribution of the light over the rings is different, again the obstructed telescope shows more light in the rings. The wavy nature of the rings is due to the calculation-methods (slight undersampling). The Aberrator will show more of these effects when defocus is more then 10 wavelengths. For such defocus values a higher aperture will lead to more realistic calculations. |
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