Strange water formation in long exposure

Started Jul 22, 2013 | Questions thread
Wei Kelun
Wei Kelun Contributing Member • Posts: 524
Re: Strange water formation in long exposure

Puzzling indeed. I think it looks like a strobe effect, from something flashing regularly between 16 and 32 Hz. This would exclude a natural source, since a branch in the wind or some other interruption of the natural light would neither be that regular, nor that rapid.

Note that if the pulses came at 16 Hz, then the number of pulses delivered would match the 2-second exposure time.

It would make sense for a stobe to illuminate an isolated event like a random water droplet without having much of an effect on the rest of the water, because the rest of the water would be blurred because it's constantly changing.

Looking into the water, however, there are other instances of sharp details consistent with a strobe catching an isolated droplet or bubble here and there.

With a Canon 5XX flash on MULTI, you can enter the frequency of pulses, the duration of the burst, and the power setting. So I'm voting for a stroboscopic flash programmed for 2 seconds of pulses (matching the exposure time) at 16 Hz.

Perhaps flash was used deliberately as a fill flash, to try and cast some light into the darker areas under the ledge and the leaves. Not a bad idea, but next time, take it off MULTI first!

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