Have you found a solution for this?
I am having the same issue trying to use the camera in ARKit to take a photo with the AR scene.
This seems to only be on the iPhone 7/8 plus as far as I can tell... tested on a 6s/7 and the background is sharp. Any resolution?
This ***** and makes ARKit really un-fun for me. Everything more than a foot away is blurry.
THANK YOU for pointing this out. It's been driving me mad on my iPhone X... The cameras take amazing photos and videos, and then ARKit looks bad.
I guess it makes sense, though, to the original point here: ARKit probably provides a fixed focus so that the real-world tracking can work better. That's my assumption, anyway. It would be awesome for devs to be able to set this focus, though... Or even allow the cameras to autofocus like they normally do. I guess that would throw off all kinds of stuff, though.