Chosen Solution
Just bought the used S7 on ebay and immediately noticed how bad the camera is on this. Seems like I’m always out of focus/softened/blurred whether in the camera app or snapchat. (All beauty settings are down to 0). Is something broken or what?
Is the camera focusing at all? If not, the rear camera needs to be replaced. Here is a guide in case you decide to replace the rear camera: Samsung Galaxy S7 Rear Camera Replacement
