Airy disk - Wikipedia
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
Lens Diffraction and Photography from Cambridge in Colour.
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)
Diffraction Limited Photography: Pixel Size, Aperture and Airy Disks
[Photo Tips] Ever you've wondered about how diffraction affects image quality? #diffraction #photography
Understanding Diffraction - Diffraction Limited Photography: Pixel Size, Aperture and Airy Disks
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.