the double shutter speed rule ruins your video

Started 5 months ago | Discussions thread
Entropy512 Veteran Member • Posts: 5,304
Re: the double shutter speed rule ruins your video

John Brawley wrote:

Svetlov Misha wrote:

impulse duration of the flash canon 430exII set to 1/64 is 1/10000 of a second.
it is short enough to illuminate the only one frame, isn't it? yes or no?

No.

If indeed the strobe really is that short of a duration, then the FRAME is being assembled line by line as the strobe happens to fall somewhere in the interval while this is happening.

In fact, rapid pulsing of light with a known pulse duration is one method by which people measure readout times.  CineD uses a 300 Hz strobe for their lab tests

(Yes, Jim Kasson uses a classic analog oscilloscope for his tests, but not many people still have one of those lying around!)

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