I did a flight with P4D on 90% overlap, and got 700 photos. Then I created same mission with 80% overlap and it was like 1/2 the photo count (or less I recall). It occurred to me that the overlap is both side and front, so a 10% increase on both has a multiplied effect.
On Drone Deploy, we can choose different side and front overlaps, and I am now seeing this is somewhat critical to controlling how many photos I want taken.
Its important enough that it makes P4D second choice for flight control currently. Its too bad, as I like the double grid structure mode of P4D. I’m just surprised we can’t choose increments of say, 1 or 2% for overlap as that affects post processing time and several things.