Photographing American Civil War Era Cannons
When I photograph American Civil War era cannons, I try to get:
The whole cannon from several angles
A photo of the whole display including any monument which may be present
The carriage or pedestal upon which the cannon is mounted
Any informational sign or plaque about the cannons or the display
Markings stamped onto the cannon - paying attention to the muzzle face, the trunnions, the top of the tube, and the breech area. Markings give information about the place and year of manufacture, name of inspector, and registry number.
Finally, anything which seems unusual about the cannon, the display, or the setting.