I recently upgraded from an iPhone 5s running iOS 9 to an iPhone SE running iOS 10.
One thing I have noticed is that no matter how hard I try, the phone always says the pictures I've taken are either slightly blurry or blurry. I've even tried putting the phone on something stable to eliminate the possibility that I'm moving the phone during the exposure, but still get slightly blurry to blurry photos.
I've never had this problem with the iPhone 5s and iOS versions 8 and 9. I always got pictures that were described as crisp or sharp.
So, is this a bug in iOS 10 or a defective camera in the phone?