To test these equations, photographs were taken of a grid using three
digital cameras with different sensor sizes and pixel resolutions (the 5 million
pixel Nikon 5400 compact digital, the 6 million pixel Nikon D70 digital SLR
and the 3 million pixel Canon A70 compact digital), three image-to-object
distances (400 mm, 600 mm and 1000 mm), three tilt heights (0 mm, 85 mm
and 140 mm).