Samsung has announced that their Unpacked event where it will runveil the Galaxy S9. Its upcoming flagship phone will make its debut at Mobile World Congress in Barcelona on February 25th. The teaser Samsung posted on Twitter hints at the S9's "reimagined camera." While the company didn't say anything more than that, one of the phone's rumored features is a variable aperture camera. According to the current rumors, the device's 12-megapixel shooter will be able to switch between f/1.5 and f/2.4 apertures. As you might know, f-stop pertains to the opening that lets light into the camera. The bigger the number is, the smaller the opening and the smaller the amount of light that can go in. Having the ability to let more light in could improve a phone camera's performance in low lighting.