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Water streak effect


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#1 George Ebersole

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Posted 21 December 2016 - 11:36 AM

For mosters and time lapse shots there's an effect where falling water or water rushing over rocks gets all fuzzy, blurry and in general cool looking.

 

Has anyone tried to achieve this with digital video?

 

If so, how did you do it?


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#2 Macks Fiiod

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Posted 21 December 2016 - 12:01 PM

Link a sample of it?


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#3 David Mullen ASC

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Posted 21 December 2016 - 12:46 PM

To get moving water like in a river to be streaked requires very long per-frame exposures, which isn't possible when the camera is running at 24 fps where even with a 360 degree shutter angle (no shutter at all) the max exposure time is therefore 1/24th of a second.  You'd have to shoot at a very low frame rate (like 2 fps, etc.) and then stretch it make to normal speed in post, but then the motion of people in the shot will also be blurred and very steppy due to the low sampling rate.


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#4 George Ebersole

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Posted 21 December 2016 - 02:26 PM

Yeah, I thought it might require some post work, but I thought maybe someone had figured out a cheat or a workaround to get the same thing in camera.


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#5 David Mullen ASC

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Posted 21 December 2016 - 02:39 PM

Heavy motion blur requires longer-than-normal exposure times.  Once you go to a 360 degree shutter angle, the only way to increase per-frame exposure time is to drop the frame rate.

 

The Canon XL1 DV camera had such a feature for low-light photography where they reduced the frame rate, got longer exposures, and internally restored the motion speed back to normal.


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#6 George Ebersole

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Posted 22 December 2016 - 12:38 AM

And yet another reason I'm kicking myself for not buying a Canon.


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