The summer programme kicks off this year with a talk tonight by photographer Peter Frost.
It's titled Your tourist photo, my livelihood.
Peter says overseas visits provide opportunities to photograph interesting people, places and activities.
"What lies behind such photos?" he asks.
He describes the back story to some of these, emphasising their place in people's livelihoods. Examples include "trading mopane worms, wrapping leaves, khat, African polony, and bushmeat".