Agisoft Photoscan help

[DanielZA]

Hi My name is Daniel,
I have a few questions to ask and it will be awesome if someone could help me?
How do i get the distortion out of my model like for example i have a model that i created a
3d map but the top of the roofs are distorted could it be because of camera calibration?
Or is it something Else? Another question is how do i use agisoft lens step by step?
And last question how do i get the best possible 2d Map? I just cant get my crisp clear
2d map i have a 20mp camera and im only flying 100metres?
Kind
Regards
Daniel