Just testing out the inbuilt camera's HDR feature on a flower that has plenty of highlight and shadow details to see what it can actually do! I set the 'Auto HDR' feature off in 'Settings' as you never actually know when the camera will choose to use it and then turned HDR on in the camera. This first image is without HDR and choosing to focus on the yellow bits of the iris flower. This next one is with HDR turned on and choosing to focus again on the yellow bits of the iris flower. There is a tiny bit more detail to this, but not the exponential leap that blending three exposures should actually create. This following image was taken using the PureShot app in Auto Exposure mode and by taking three bracketed exposures two stops apart, saved as a RAW file and assembled in Lightroom, with Auto Toning applied, and no other adjustments to it. I did not apply any sharpening or noise reduction to this following image at all. I used spot metering placed on the yellow bits of the iris flower and focused on that same point. It has exponentially more detail to it than using the inbuilt cameras HDR feature! This shows me that the iPhone 8 plus has a damn good little camera built in, it's just not being fully utilised by the inbuilt camera app and its HDR feature.