"Rolling-waves" only in PAL?

[recman]

When I look at movies filmed with the D90 I noticed that movies that seems to be made in the US (NTSC) doesnt have the rolling-waves-effect as much as us poor europeans Is this correct? Is the rolling-waves-effect not as common in NTSC as in PAL?

 

[mattsand]

it really has nothing, at least not explicitly, to do with pal and ntsc, it's the line frequency. 60 hz lights flicker at 120 hz, which means *exactly* 5 flickers per frame (24*5=120), which means that more shutter speeds match than under 50 hz lights where only 1/50 is perfectly safe.

/matt

 

[Lee Wilson]

...

 

[recman]

it really has nothing, at least not explicitly, to do with pal and ntsc, it's the line frequency. 60 hz lights flicker at 120 hz, which means *exactly* 5 flickers per frame (24*5=120), which means that more shutter speeds match than under 50 hz lights where only 1/50 is perfectly safe.

/matt

Aha, ok. 60hz lights, is that "standard" in the whole world? Or does for example US use another hertz on lights? (I now nothing about this so maybe the question is totally stupid... )

 

[mattsand]

You already know the answer as evident by your op. North, and largely south i think, america and japan use 60 hz, the rest 50.