Before revision: Since this is the radius of the Airy disk, the resolution is better estimated by the diameter, Specific cases Log-log plot of aperture diameter vs angular resolution at the diffraction limit for various light wavelengths compared with various astronomical instruments.
After revision: Since this is the radius of the Airy disk, the resolution is better estimated by the diameter, Specific cases Log–log plot of aperture diameter vs angular resolution at the diffraction limit for various light wavelengths compared with various astronomical instruments.