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Pulsating grain from one roll of 500T Vision 3

Pulsating blue grain

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#1 Kip Kubin

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Posted 06 September 2016 - 04:48 PM

Here's the situation.

 

All stock bought from Kodak directly.

 

 

Shot a music video with an Arri SR2 with new stock from Kodak - No problems

 

 

Shot 2 additional mags of short ends on an Aaton XTR  - Stock about 2 years old - Refrigerated 

 

One short end - 50 ft - No problem other than a slightly higher amount of grain than the Arri Rolls

 

The other has an issue - the grain pulsates - it's constant in its pulsing or and the grain is substantially more blue in the shadows than the previous roll.

 

By pulsating I mean it comes and goes at consistent fast intervals - its there - it fades out - it's there again

 

Can't post a clip as its for a major label and the material is unreleased.

 

Has anyone seen this before?  Im just trying to avoid it in the future.  Im assuming its the age of the stock - and possible mishandling but could it also be camera related?

 

Thanks


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#2 David Mullen ASC

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Posted 06 September 2016 - 05:44 PM

Could be x-ray damage...


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#3 Tyler Purcell

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Posted 07 September 2016 - 01:43 AM

Do the pulses speed up or slow down based on where you are in the reel, or is it identical from start of reel to end?
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#4 aapo lettinen

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Posted 07 September 2016 - 03:35 PM

if it's intensifying/fading every turn of the roll then it might be temperature damage or pressure sensitization. if a roll is stored for example in the fridge in a way that one side of the roll is much warmer than then other and it's like that for long time then it may do this kind of damage: other side of the roll ages faster than the other. I have had this kind of problem in some eBay rolls but otherwise not that common. I rarely store rolls for more than two years after purchase though so if yours was very old it is easier for it to generate this kind of problem. 

X-ray damage is normally faster pulsing which may "sweep" across the image as far as I have seen


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