On Wed, 6 Jan 2021 23:08:51 +0000 (UTC)
Eli the Bearded  wrote:

> In comp.sys.raspberry-pi, Ahem A Rivet's Shot   wrote:
> > Axel Berger  wrote:
> >> Exactly. And there is another thing. Originally video had to be fast,
> >> for the eye needed at least 70 Hz not to see annnoying flicker. Those
> >  That number seems to have been creeping up all my life - 24FPS
> > was once considered good enough for movie cameras.
>
> Possibly, but probably not. Thomas Edison believed 48 FPS was minimum
> quality projection. Is that during your life?

 No, but 50Hz interlaced monitors (stripped TVs really) are and
removing the interlace was considered enough to make it flicker free and
"professional" circa 1980 - I sometimes turned the interlace back on and
pushed the resolution up. In more recent times 60Hz was said to be needed
for flicker free and now it's 70Hz I'm seeing and high end TVs are currently
advertising 120Hz.

> Film was recorded at 24
> FPS, yes, but projected so that each frame was shown two or three
> times, 48 to 72 FPS.

 Weren't domestic cine projectors 24 fps and considered good enough
for the use ?

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