High wing aircraft are preferable to low wing aircraft for hand-held aerial photography.
The 'drop hatch' in aircraft such as the DeHavilland "Beaver" and "Otter" are convenient to use for vertical aerial photography without performing aircraft structural modifications.
Oblique aerial photography can preferably be done through an open window rather than through window glass/plastic.
Photography through the aircraft door opening (having removed the door prior to flight) is also frequently done.
Tethered balloons provide an inexpensive photography platform for long-term monitoring of a specific site.