What does a 3 bladed shutter do differently from a 2? Nothing apart from project each frame 3 times, producing an image flicker frequency of 72hz. A 2 bladed shutter produces 48hz. If we chop off one of the blades in a 2 bladed shutter (not the pulldown mask obviously, unless we want this effect) we will get 24hz, … Continue reading 3 bladed shutter