"narrow aperture" is correct and usable in written English.
You can use this phrase to describe a physical opening or gap that is small in dimension. For example, "The keyhole had a narrow aperture, so I had difficulty seeing inside."
It is oval in shape, with a long and narrow aperture, and possesses an agatelike sheen and fine markings.
The shell is typically straight-sided, with a tapering body whorl, low spire, and narrow aperture (the opening into the shell's first whorl).
Like Christley, he writes taut conversational prose in which the humiliation of gig employment hisses like a firehose forced through a very narrow aperture.
A new, very simple expression for the narrow aperture dimension of the horn is obtained and used in the optimum gain pyramidal horn design.
She and Bonnefoy turned to the documentary's opening shot: a tunnel in Hong Kong, filmed with a narrow aperture, so that the camera appeared to be speeding through black space.
Scatterograms were obtained by focusing a white light beam with narrow aperture (< 5°) onto at a small circular area (diameter ~ 13 µm) of the object, and the spatial distribution of the far-field scattered light was then monitored.
Narrow apertures at the beginning of cristae of the mitochondrial inner membrane that link cristae to the inner boundary membrane.
Narrow apertures led into soaring caverns, where frescos adorn vaulted ceilings and rock-hewn tables sprout like mushrooms from the floor.
It would seem that the average English professional – a tautology, I know – nowadays views the game through the same inanely narrow apertures as the rest of us.
After that comes movies and the tale of how a freewheeling, chaotic and creative industry was cornered by a cartel of vertically integrated corporations which for decades channelled all cinematic creativity through a set of narrow apertures.
Audio will provide an effective medium for unobtrusively leveraging those narrow apertures.
