On Thu, 20 Dec 2018 00:08:22 -0000, "William Gothberg" "William
wrote:

On Wed, 19 Dec 2018 23:53:42 -0000, Rod Speed wrote:



"William Gothberg" "William wrote in message
news
On Wed, 19 Dec 2018 16:21:41 -0000, Mark Lloyd wrote:

On 12/19/18 6:01 AM, William Gothberg wrote:

[snip]

They probably are fairly crude. I know they flicker, for example if I
use my cordless drill, the chuck appears to spin the wrong way under the
LED lighting.
I remember seeing that with a washing machine (under fluorescent
lights). As the tub was slowing down, the row of holes around the tub
would appear to reverse direction. Same thing with (spoked) wagon wheels
in movies.

It looks absolutely ridiculous with modern cars with LED headlights in
films. How hard can it be to put a smoothing capacitor on the output of
the power supply?

No point when the only thing that has a problem is videos.

You don't even see a problem with dashcams.

You should. Surely they operate in a similar way to movie cameras?


Different frame rates.