the.com/hyperfocal
the one focus distance that makes near and far both look sharp enough to trust.
means the closest focusing distance at which a lens keeps everything from half that distance to infinity acceptably sharp.
from from photographic optics: photographers needed a way to maximize depth of field without a computer in their pocket, so they built charts and later apps around this single magic distance tied to aperture and focal length.
depends on aperturesmaller aperture pulls the hyperfocal distance closer
landscape staplefavorite trick for keeping foreground and mountains sharp
not infinity focusfocusing at infinity actually wastes usable sharpness
circle of confusiondefined partly by how picky your eye is