Airy disk of Polaris, demonstrating
Saturday 20th of October 2007 10:19:53 PM
A 4.5" Newtonian at FL=900mm and a 3x Barlowed ToUcam webcam capturing at 5 fps the Airy disk of Polaris, slightly unfocused. One can clearly see the Airy disk and surrounding rings broken up by the atmospheric effects (called "seeing" ). This sequence can also be used to show the state of collimation of the scope.
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