If you are using an AC power source i.e. tungsten lights you need to use a shutter speed that will not cause flicker.
The USA uses 60 Hz (60 cycles per second)
The UK uses 50 Hz (50 Cycles per second)
To avoid flicker your shutter speed should be be a multiple of twice the line frequency.
So for 60 Hz shutter speeds of 120, 60 should be good.
So for 50 Hz shutter speeds of 100, 50 should be good.
For lights that do not fluctuate (DC – Battery powered) flicker should not be an issue if all the lighting is from this source. If you have mixed lighting always use a multiple of twice the line frequency to avoid flicker.
Note I suggest using a shutter speed faster than the frame rate.
Mike
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