Desert aerial

This is the Namib Desert in Namibia photographed from a hot air balloon on my first trip to this southwest African country in 2000. I was still shooting medium format film at the time with the Mamiya RZ 67, and for all landscape work I used Fujichrome Velvia 50 transparency film. At this distance from the desert floor, depth of field was irrelevant since everything would be sharp at any lens aperture. I would have shot wide open -- f/4.5 -- and my shutter was probably 1/400. It would have been so much easier to shoot this from a drone, but drones didn't exist 25 years ago. What attracted me to this particular composition was the graphic lines and the pattern of color.