Manuel focus for the « take picture »

On my previous phone (moto G3), when I set infinity focus on “Take picture” that work really great. But on lot of new phone I tested, infinity focus mode on the take picture feature make blurry photos. 

After some search I undertending that the range on the focus is no limear. So for exemple if we define the begin of the focus range at 0 and the end at 1000 : 0 focus on a medium point, 250 on infinity and 1000 on the nearest point. 

So it will be very useful to have a manual focus paramètre where we set a number between 0 and 1000 that set the focus on this focus range.