For telescopes with circular apertures, the size of the smallest feature in an image that is diffraction limited is the size of the Airy disk. As one decreases the size of the aperture in a lens, diffraction increases. At small apertures, such as f/22, most modern lenses are limited only by diffraction.

Behind, concealed by woods of pine, / There grew on plains the uveous vine;

We acknowledge him [God] our sovereign good.

Soon Numan had picked up a fiercely loyal fan militia called the Numanoids, who followed him with the obsessive tenacity that only sustained ridicule can foster.