If a tree is alive, the cells of the tree has moisture, water, sap, etc. Trees will conduct electricity. A two by four piece of lumber that is moisture free will not conduct electricity.
OldEarl wrote:
I might point out that 1) a mono-pod is shorter than a photographer, and 2) lightning hits non-conductors such as trees quite a bit.
Also, having some experience with lightning shots--it took me about fifty rolls over a six month period to get the one good print in my basement--you find a human made structure for shelter.