the.com/aperture
the eye's diaphragm and the camera's borrowed trick for deciding what gets to blur
f-stop mathsmaller number means wider opening, more light
depth controlwide aperture isolates subject, narrow keeps all sharp
human irisyour pupil is a living, dilating aperture
telescope powerbigger aperture gathers more light, sees fainter stars
bokeh sourceblade shape sculpts out-of-focus highlights into circles