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


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#1 Alexander Disenhof

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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


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#2 David Mullen ASC

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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.
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#3 Alexander Disenhof

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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


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#4 Phil Rhodes

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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.


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