The Oppo F7 comes with a F1.8 aperture lens for its rear-facing camera. A larger aperture ensures that more light can traverse through the lens and reach the sensor, thus improving the low-light performance of the camera. Of course there are other things that affect that image quality, like the pixel size, sensor type, optical quality of the lens, image processing, etc, but having a fast aperture on a budget phone can compensate for the lack of other advanced camera features.
I am not a fan of cameras over 12MP and I prefer having a camera with larger pixels. Of course it depends on the size of the sensor, but I am skeptic about the Oppo F7 having a large sensor due to the phone's price (~$340). If there were large pixels, I'm sure Oppo would have mentioned it.
Also it seems that the main focus is on the front selfie camera, so I assume that the rear camera wasn't given all the attention it needs. I wish Oppo could have provided more detailed technical specs on its website (oppo.com) because their specifications page is really basic with very little information about the hardware.
Anyways, it's good to see a fast aperture lens on this model, but I still need to check out some Oppo F7 sample images to see how this main camera performs.