FocusBugThe insect-like shape with antennas in the middle of the screen is the FocusBug and the main way of controlling the app. It controls the sweet spot, or the portion that stays in focus, while the outside area blurs. Click the middle of the body, and a round grid shape appears. This is the sweet spot, and you can adjust its size, shape and position.
The legs set the size and shape of the blur, while clicking on the bug itself and moving it around the scene changes the position. The antennas control the type and amount of blur, as well as the hardness of the blur edge. You can make the legs longer to increase the axis of the FocusBug or twist the legs to rotate its shape.
The FocusBug’s shape can change from round to planar (or square). The round version acts more like a selective-focus lens or filter, while planar is helpful when simulating depth-of-field effects or creating the swing and tilt movements of a tilt-shift lens.