Oct 7, '05. All of these shots are taken from Fort Baker in Marin county. The fast auto focus of the Canon 1DmkII with AI servo was used to track moving subjects and allowed the use of a 1.4X teleconverter with a slow 400mm 5.6 lens. Very fast shutter speeds (1/2500 sec.) were used with high ISO setiings (1600) to freeze motion.