hexagonal crystals create a halo around the moon. in optics it is called an airy disk and size due to diffraction of light. I was able to observe this about a week ago from my home town. beautiful

hexagonal crystals create a halo around the moon. in optics it is called an airy disk and size due to diffraction of light. I was able to observe this about a week ago from my home town. beautiful

Minimum Airy Disk diameter and corresponding maximum resolution   depending on disk separation for a diffraction-limited lens and green-yellow light (0.000555 mm wavelength)

Minimum Airy Disk diameter and corresponding maximum resolution depending on disk separation for a diffraction-limited lens and green-yellow light (0.000555 mm wavelength)

[Photo Tips] Ever you've wondered about how diffraction affects image quality? #diffraction #photography

[Photo Tips] Ever you've wondered about how diffraction affects image quality? #diffraction #photography

Airy disks not resolved

Airy disks not resolved

Lens aperture and diffraction. Nikon D5100 due pixel size 4.8 µm above f11 starts to show difraction, while Nikon D4 with pixel 7.3 µm shows difraction above f16.

Lens aperture and diffraction. Nikon D5100 due pixel size 4.8 µm above f11 starts to show difraction, while Nikon D4 with pixel 7.3 µm shows difraction above f16.

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