An aperture camera refers to a type of camera that has an adjustable opening called an aperture. The aperture controls the amount of light entering the camera, which affects the brightness and depth of field of the photograph. Full definition
Switch aperture manually: The dual aperture camera on the S9 and S9 + is unique. (pocket-lint.com)
What's particularly interesting is that the S9 series is the first with a variable aperture camera, with the lens able to shift form f / 1.5 to f / 2.4. (androidcentral.com)
Phone will come with a 12MP F / 1.7 aperture camera on the rear. (myfixguide.com)