Changing apertures is referred to as "stopping down" (if you make the aperture smaller) or "opening up."
A na-akpọ mgbanwe a dị ka "ịkwụsị ala" (ọ bụrụ na ị na-eme ka oghere gị dị obere) ma ọ bụ "mepee" (ọ bụrụ na ị na-eme ka oghere gị dịkwuo ukwuu).