"adjustable iris" . . . "aperture stops" . . "f/2.2" . "aperture" . "aperature" . "f/1.8" . "manual aperture" . . "small hole" . "apertures" . . "lens aperture" . "faster" . "f/10" . "f-number, f-stop" . . "''camera aperture''" . "optical aperture" . "aperture diameters" . "f/1.9" . . "focal depths" . "camera's aperture" . "light-collecting area" . "Aperture#Optimal aperture" . . "aperture stop" . "aperture control" . "Aperture" . "Aperture" . "f/2.0 aperture" . . "1.6\\\" to 4\\\"" . "Aperture range" . . "Max. Aperture" . "f/2.8" . "aperture ring" . . . "f/2.0" . . "Maximum Aperture range" . "wide open" . . "aperture values" . "stop" . "f" . "Aperture Gallery" . "Stop-down Metering" . .