Define a standard viewing condition.

Using a cardboard built 4×5″ analog foto camera box without further framing help (viewer),
except for an air-level and constant positioning at ‘belly hight’. Handheld.

Resulting in a straight 50:50 horizon and vertually perfect frontality.

 

Test comparison of the Berlin Wasteland site and a neighbouring site,
a few hundred meters down the river spree.