I'm not gonna lie to you. At first when I got my Lumia 640 XL I was impressed by the camera, yes, just didn't feel quite satisfied with the quality (always in medium-low light environments I got too much noise in the pictures), then I searched for answers on the internet because it wasn't supposed to be like that (was not even dark and still got much noise) and understood how does everything work in the Lumia Camera app: ISO, shutter speed, etc. After that I downloaded this picture details app and after studying each picture details I discovered that in the auto mode the Lumia Camera app, when not in very well illuminated places, it always decides to increase ISO, waaaay to much. This because higher ISO means higher sensibility to light so it can take pictures very fast and get a not so dark picture (the lower the shutter speed the less time the camera has to capture light, then, as Lumia Camera app always goes for very low shutter speed it decides to increase a lot ISO), but when this happen it SACRIFICES IMAGE QUALITY CREATING NOISE. This I why I decided to create this thread. If you, like me, feel unsatisfied just do this and understand Lumia Camera, it's very easy. When taking a picture in let's say a room with medium light just set your ISO to the lowest, if it gets too dark increase it a bit, but never exaggerate.
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