The optical centre in the brain can distinguish up to 16 light
impulses per second, and the retina in the eye up to 50. Hence with a
film projected at 24 or 25 fps, you need a shutter setting so that
each frame is projected twice, with a brief interruption, leading to
48 or 50 impulses per second. If there are significantly fewer light
impulses per second than 50, you will get flicker. However, in order
to get a continuous sense of movement, the optical centre in the
brain requires no more than 16 fps (which would have to be projected
with two shutter interruptions per frame to be flicker-free).
H
> dear list,
>
> i seem to remember that the subject of 'flicker' had already
> been shortly discussed a while ago ... however: could somebody
> please explain how this works, what's the connection to concepts
> such as 'persistence of vision,' or 'after-image'? and - how does
> flicker function in digital films ... or does it? e.g., would a
> digital version/rendering of conrad's 'flicker' be able to do ist
> magic???
> thanx much for your help .... highly appreciated!
> best,
>
> bernd
>
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