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.

How do I love thee? Let me count the ways.

He had never felt a pain or a sorrow, and did not know what they were, in any really informing way. He had no knowledge of them except theoretically—that is to say, intellectually. And of course that is no good. One can never get any but a loose and ignorant notion of such things except by experience.

As when a Faulcon hath with nimble flight / Flowne at a flush of Ducks foreby the brooke […].