Chronographer_AC:
#4: Lens surface paralle to the surface of vertical columns - keystone mitigation technique, no post processing
Chronographer_AC:
#3: Camera tilted up. Keystone mitigation technique - uncorrected, unprocessed
Chronographer_AC:
#2: Keystone mitagation using post processing
Chronographer_AC:
#1: Keystone mitagation using post processing