Edge Weighting: When modo calculates Depth of Field, rays are fired in a pattern that simulates the iris blades producing the bokeh effect shapes. The edge weighting option concentrates those rays toward the center or edges of the iris, depending on the value. A value of '0%' concentrates all the values at the center of the iris, while a setting of '100%' concentrates the rays to ward the outer edge. A value of '50%' evenly distributes the rays. A light tends to be stronger in the outer edge of the iris in the real world, setting around 60% to 70% tend to produce the most realistic results.