In message , "Dave Plowman (News)"
writes
In article ,
charles wrote:
In article ,
Dave Plowman (News) wrote:
In article ,
charles wrote:
The studio lighting, unless dc driven, neads to have the same
frequency (to a first order) as the tv system. A serious 10Hz beat
can happen if not.

Must make location shooting with battery cameras impossible. ;-)

It shows taht you were only ever involved with sound.

But closely involved with actual shooting. My guess is you weren't?

When TV came off mains lock, it would have then been kept to an extremely
accurate 50 Hz (or whatever). Mains can vary quite some way either side.


Not by a lot, take a look at this item.

http://www.dynamicdemand.co.uk/grid.htm#


--
Bill