Jump to content


Photo

Throwing the "shutter" of of Phase on the original Alexa


  • Please log in to reply
3 replies to this topic

#1 Alexander Disenhof

Alexander Disenhof
  • Basic Members
  • PipPip
  • 86 posts
  • Cinematographer
  • Los Angeles, CA

Posted 11 July 2013 - 04:30 PM

I'm looking to create vertically smeared highlights that occur when you put the shutter in a film camera slightly out of phase with the film movement.  The effect is seen in movies like The Limey and Saving Private Ryan.  Anyone know if you can do something comparable to this on the original Alexa, with it's electronic shutter?

 

 

Thanks!

 

Alex Disenhof


  • 0

#2 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 19769 posts
  • Cinematographer
  • Los Angeles

Posted 11 July 2013 - 05:00 PM

Since there is no film to be advanced to the next frame, causing the smear while the shutter is still coming in to cover the gate, I don't see how a digital camera could create this effect even with a mechanical shutter.
  • 0

#3 Alexander Disenhof

Alexander Disenhof
  • Basic Members
  • PipPip
  • 86 posts
  • Cinematographer
  • Los Angeles, CA

Posted 11 July 2013 - 05:32 PM

Very true.  Just wondered if they had a digital equivalent buried in the camera somewhere!

 

Thanks David!

 

Alex


  • 0

#4 Phil Rhodes

Phil Rhodes
  • Sustaining Members
  • 11943 posts
  • Other

Posted 11 July 2013 - 07:09 PM

I beg to differ: when you switch on a Viper, it does something very, very similar to the out-of-sync-shutter effect, while its mechanical shutter gets up to speed and synchronises with the electronics. With a frame-transfer CCD, the image is transferred line by line across the face of the sensor (into, effectively, another dummy sensor that's kept under an opaque shield). The image is very literally "pulled down" (or possibly up), moving across the sensor. If the sensor is still exposed to light while this is occurring, there's nothing to stop the photosites contributing extra charge to the charges being transferred through them.

 

So yes, if you put the shutter out of phase on a Viper and possibly on other camera systems using similar technology, it will do similar things. I'm not aware it's actually possible to do that, mind you, so this is really only of academic interest.

 

The effect is really quite easy to simulate in postproduction, anyway: take the image, crush everything you don't want in the effect to black, apply vertical blur, move upward to taste, composite back over the original with "add" transparency.


  • 0


Abel Cine

Gamma Ray Digital Inc

Willys Widgets

Glidecam

FJS International, LLC

Wooden Camera

Broadcast Solutions Inc

CineLab

Visual Products

Paralinx LLC

Technodolly

Ritter Battery

Opal

Aerial Filmworks

Tai Audio

Metropolis Post

CineTape

rebotnix Technologies

Rig Wheels Passport

The Slider

Media Blackout - Custom Cables and AKS

Tai Audio

CineTape

Aerial Filmworks

Wooden Camera

Media Blackout - Custom Cables and AKS

Broadcast Solutions Inc

FJS International, LLC

The Slider

Abel Cine

Gamma Ray Digital Inc

Visual Products

CineLab

Opal

Rig Wheels Passport

Metropolis Post

Glidecam

Willys Widgets

Ritter Battery

rebotnix Technologies

Paralinx LLC

Technodolly