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Strange flicker


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#1 Edgar Nyari

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Posted 06 December 2016 - 12:32 PM

Greetings,

 

I have this strange case of flicker on a single roll of film we shot. The entire roll seems to have the flicker but it's much more visible in dark scenes. At first I thought that one of my mags was faulty so the motor couldn't establish the film speed correctly so it kept speeding up and down. But I have a cinematography-electronics crystal control for Arri 35-III, and I doubt that it would behave like that and I don't remember seeing the light yellow/orange (which happens when it's not in full speed). Then I thought maybe the batter was too low.

 

But later I noticed that the brighter parts are not really overexposed (as it would be in the case of speed fluctuations), but they seem to be bluer and hazier/granier. Also when I stop the brighter frames and move frame by frame, I see a "wave" of brightness somehow pass upward on the image, instead of the entire image being brighter equally. And then towards the end of the roll it suddenly stops and the exposure seems normal and colors a bit warmer. On the frame where it switches to normal, it seems the frame is split and the upper part is a bit brighter and lower darker.

 

All this led me to conclude that it's not the motion of the camera, and that the roll was "flashed" somehow only on one side of it or something to that effect. If that were the case the rhythm of the flicker would accelerate or decelerate over time, depending on whether that happed prior or post exposure in camera (because the head and tail would switch their places from the core to the outside part of the roll). But I didn't measure flicker intervals to determine that. This is a short end, so it could be a loading error either on my part or the person that recanned it prior to me.

 

But I could be very wrong about this. Maybe it's even a lab mistake? Or is it the camera?

 

Can someone please take a look at this clip and comment? This is the very last roll of our shoot and a some of the crew staid for champagne to celebrate the wrap so we shot that.

 

 

Sorry for the YT compression and softness, but you can see what I'm talking about.

 


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#2 Edgar Nyari

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Posted 06 December 2016 - 12:46 PM

More info:

 

looking at the rhythm of the flicker as it changes from the start of the roll to the end, I find something strange. At the start it goes in a different pattern:

 

flash flash flash flash (4X).....pause.....flash flash (2X).....pause (longer)........then 4X...2X.......4X...2X,

very strange. Towards the end of the roll (in the clip you see) it doesn't come in bursts of 4 and 2, but has regular intervals as you can see in the clip


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#3 Dirk DeJonghe

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Posted 07 December 2016 - 12:23 PM

Looks like X-ray damage to me. Did the magazine pass X-ray inspection with the reel partially exposed? 


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#4 Edgar Nyari

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Posted 07 December 2016 - 12:30 PM

No. The only transportation that the film has seen was via mail/courier. And after production this roll was in the same package as several other rolls which didn't have this problem at all. So whatever happened must have happened before it came into my posession. And I'm also sure it didn't happen on the way to me when I purchased it, because it was in the box with many other rolls that turned out fine. That being said, it's a short end, so it could have happened while it was still in posession of the previous owner (who has purcahsed it and resold it by the way...)

 

The important thing for me is that it's not a magazine or camera fault. Working with short ends of old film (this is 5218 so It could be pretty old) is a gamble, I know, but having faulty equipment is much worse.


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#5 Tyler Purcell

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Posted 07 December 2016 - 02:18 PM

The fact it all of a sudden goes away and is in the center of the image as much as the outsides, that kinda tells me X ray damage as well. If it were the camera, it would be consistent, not pulsing. If it were a minor leak, once the film unraveled, it would change considerably and maybe disappear all together within a second of the camera start. Xrays penetrate based on strength, so they would literally penetrate into the roll a certain amount and no more.

My guess is the film was damaged from the beginning, long before you got a hold of it.
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#6 Edgar Nyari

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Posted 07 December 2016 - 03:24 PM

Thank you Tyler. That sounds as a convincing explanation.


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#7 Robin R Probyn

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Posted 08 December 2016 - 01:09 AM

Light leak from the mag is a reddish flare.. not white like that.. and usually only along the outer edge of the film.. I dont think its that..


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