altitude mode

Hi Folks, We have a potential client who is in Santiago in Chile and he is asking how the performance is affected by altitude. His altitude is typically about 3000m, therefore can anyone on this forum who lives or has had experience of flying at higher altitude please advise on the typical...

First of all..sorry for my poor english.. It was the weekend so i have plenty of time to fly around with 3 fully charged battery pack. Everything when smoothly as planned, outdoor angle, indoor angle. Done! went back home to check the footage and **** i forgot to take off the ND filter off when...