Help Me Understand Why Tap to Focus

[AIRSPACE]

Peak threshold seems helpful, what about the different percentages?

I should have included that... Its to do with how the sensitivity of the focusing software whether something is in focus or not. When it is at 90% it is quite exact with what is or not in focus and how it displays the red lines on the image.

With the example of a building say 50m away looking at it with peak threshold @ 70% the red lines would appear all around the edge of the building but if you turn it up to 90% it is more exact and there would be less red on the building and it would be more specific about what edges are in focus and is not. A lower threshold setting makes the software a little lazier.. I think its probably best to leave at 90%