In a telescope with a deformed mirror, you have weird diffraction rings (Airy rings) Four lobes: https://telescope-optics.net/images/4v_spider2.png https://te

In a telescope with a deformed mirror, you have weird diffraction rings (Airy rings) Four lobes: https://telescope-optics.net/images/4v_spider2.png https://telescope-optics.net/images/4v_spider2.png Three lobes: https://www.researchgate.net/figure/11-Diffraction-pattern-of-a-telescope-with-deformed-optics-showing-a-three-lobed_fig19_305768831 https://www.researchgate.net/figure/11-Diffraction-pattern-o...