Jump to content


Photo

Water streak effect


  • Please log in to reply
5 replies to this topic

#1 George Ebersole

George Ebersole
  • Sustaining Members
  • 1411 posts
  • Industry Rep
  • San Francisco Bay Area

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?


  • 0

#2 Macks Fiiod

Macks Fiiod
  • Basic Members
  • PipPipPipPip
  • 747 posts
  • Director
  • Og from DC, Now in NJ

Posted 21 December 2016 - 12:01 PM

Link a sample of it?


  • 0

#3 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 19199 posts
  • Cinematographer
  • Los Angeles

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.


  • 0

#4 George Ebersole

George Ebersole
  • Sustaining Members
  • 1411 posts
  • Industry Rep
  • San Francisco Bay Area

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.


  • 0

#5 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 19199 posts
  • Cinematographer
  • Los Angeles

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.


  • 0

#6 George Ebersole

George Ebersole
  • Sustaining Members
  • 1411 posts
  • Industry Rep
  • San Francisco Bay Area

Posted 22 December 2016 - 12:38 AM

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


  • 0


Metropolis Post

Quantum Music Works

FJS International, LLC

Abel Cine

CineLab

Glidecam

CineTape

Tai Audio

Broadcast Solutions Inc

The Slider

Pro 8mm

ZoomCrane

Gamma Ray Digital Inc

Technodolly

Ritter Battery

Rig Wheels Passport

rebotnix Technologies

Willys Widgets

Zylight

Visual Products

Aerial Filmworks

Paralinx LLC

Willys Widgets

Metropolis Post

CineLab

Technodolly

CineTape

Tai Audio

Abel Cine

Zylight

The Slider

Rig Wheels Passport

Gamma Ray Digital Inc

ZoomCrane

Glidecam

Paralinx LLC

Visual Products

FJS International, LLC

rebotnix Technologies

Aerial Filmworks

Broadcast Solutions Inc

Pro 8mm

Quantum Music Works

Ritter Battery