Litt om malteserkorset i filmprosjektoren

Malteserkorset er en sentral dings i den analoge filmprosjektoren, og den gjør to geniale ting. 1. den stopper opp bevegelsen av filmremsen slik av vi kan se klare bilder. 2. den roterer akkurat så fort at vår hjerne kan skape en illusjon av bevegelse.

En mer utfyllende beskrivelse kommer her, hentet fra Wikipedia: A commonly-held misconception is that film projection is simply a series of individual frames dragged very quickly past the projector's intense light source; this is not the case. If a roll of film were merely passed between the light source and the lens of the projector, all that would be visible on screen would be a continuous blurred series of images sliding from one edge to the other. It is the shutter that gives the illusion of one full frame being replaced exactly on top of another full frame. A rotating petal or gated cylindrical shutter interrupts the emitted light during the time the film is advanced to the next frame. The viewer does not see the transition, thus tricking the brain into believing a moving image is on screen. Modern shutters are designed with a flicker-rate of two times (48 Hz) or even sometimes three times (72 Hz) the frame rate of the film, so as to reduce the perception of screen flickering.