Usually this formula works great: Focal length/F number = Diameter of the Aperture/2 = Radius of the Aperture
So first of set your film back and focal distance and then lets say you have a 50mm lens with f/4 So 50mm/4 = 12.5mm that is the actual diameter of the aperture 12.5/2 = 6.25mm is the radius you want to use. Also pgBokeh has some cool features and fairly accurate if you have the data. ------------------------ Mohamed Selim Nuke Compositor Cairo, Egypt www.mselim.com
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