The Oppo F3 Plus features a f/1.7 aperture lens for its main camera. This is the same bright aperture you can find in the Samsung Galaxy S7 and S7 edge and it's faster than the f/1.8 of the HTC 10, OnePlus 3T and LG V20. The smaller the f-number, the largest the aperture is more light that can pass through the lens.
The lens aperture has a vast impact on the low-light performance of the camera and the image quality it produces. To get the best quality images in any lighting conditions, you want a very fast lens. Of course it becomes more crucial for low-light photography.
Let's take a look at some other phones that also sport a fast f/1.7 aperture lens camera. We have the Moto G5 Plus with an f/1.7 aperture lens, the Gionee M2017 with F1.7 lens as well and Vivo Xplay 6 also sports an f/1.7 lens, At the past we used to see this aperture only in high-end devices. In late 2016 and 2017 we get to see more mid-range phones coming with that fast aperture lens type and those phones are usually camera-focused devices. One of the reasons people buy those phones is because of their ability to perform well in almost any lighting conditions. People who want to be able to capture high-quality images in the evening, not just in daylight. People who love capturing high-quality images and sharing them with others.
So what is the different in stops between f/1.7 aperture and some of the other popular ones:
f/1.7 and f/1.8: 0.165 stops difference, 1.12x times more light
f/1.7 and f/2.0: 0.49 stops difference, 1.38x times more light
f/1.7 and f/2.2: 0.74 stops difference, 1.68x times more light
A wide aperture has more benefits other just improving the low light performance. It produces a shallower depth of field effect (mainly for macros/closeup shots), better color reproduction, lead to higher dynamic range and produce images with less image noise because the camera has less need to increase the ISO in order to produce a well-exposed image.
I personally waiting for the time what we get to see a f/1.2 lens with a relatively lower-resolution 1/2.3" sensor with huge pixels. This reminds me the time which I used to shoot with my Canon DSLR. I bought the Canon EF II 85mm f/1.2 lens because I was a shallow depth of field freak and really enjoyed shooting at night. I didn't want the lens to limit my creativity. The bottom line is that the faster the lens, the less restrictions the camera poses on the photographer. You can shoot in anytime of the day and come home with excellent shots. The day isn't over when the sunsets, it just opens up more ways to come home with more unique shots. A F1.7 aperture is a great feature to have in the OPPO F3 Plus camera and even before seeing any camera samples, I know that it will perform admirably well.